Fix Classpnp.sys Errors

Sometimes Windows system displays error messages regarding corrupted or missing Classpnp.sys files. Situations like that can occur, for example, during a software installation process. Each software program requires certain resources, libraries, and source data to work properly. Corrupted or nonexistent Classpnp.sys file can therefore effect in failed execution of the started process.

Classpnp.sys file SCSI Class System Dll. The file was developed by for use with software. Here you will find detailed information about the file and instructions how to proceed in the event of Classpnp.sys related errors on your device. You can also download Classpnp.sys file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows XP devices which will (most probably) allow you to solve the problem.

Compatible with: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows XP

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Fix Classpnp.sys errors

1 Information about Classpnp.sys file
2 Errors related to Classpnp.sys file
3 How to fix Classpnp.sys related errors?

3.1 Scanning for malicious software
3.2 System and driver update
3.3 System File Checker tool
3.4 System recovery

4 Download Classpnp.sys

4.1 List of Classpnp.sys file versions

File info

General information
Filename	Classpnp.sys
File extension	SYS
Description	SCSI Class System Dll

Software
Program	Microsoft® Windows® Operating System
Author	Microsoft Corporation

Details
MIME type	application/octet-stream
File type	Driver
System	Windows NT 32-bit
Copyrights	© Microsoft Corporation. All rights reserved.
Character set	Unicode
Language cod	Neutral

Most common Classpnp.sys file related problems

There are various types of errors related to Classpnp.sys file. Classpnp.sys file may be located in wrong file directory on your device, may not be present in the system, or may be infected with malicious software and therefore not work correctly. Below is a list of most common error messages related to Classpnp.sys file. If you encounter one listed below (or similar), please consider the following suggestions.

Classpnp.sys is corrupted
Classpnp.sys cannot be located
Runtime Error - Classpnp.sys
Classpnp.sys file error
Classpnp.sys file cannot be loaded. Module was not found
cannot register Classpnp.sys file:
Classpnp.sys file could not be loaded
Classpnp.sys file doesn't exist

Classpnp.sys

Application could not be started because Classpnp.sys file is missing. Reinstall the application to solve the problem.

Problems related to Classpnp.sys can be addressed in various ways. Some methods are meant only for advanced users. If you don't have confidence in your skills, we suggest consulting a specialist. Fixing Classpnp.sys file errors should be approached with utmost caution for any mistakes can result in unstable or unproperly working system. If you have the necassary skills, please proceed.

How to fix Classpnp.sys errors in just few steps?

Remember, before taking any action related to system files perform a backup copy of your data!

Classpnp.sys file errors can be caused by various factors, so its is beneficial to try to fix them using various methods.

Step 1: Scan your computer for any malicious software

Windows files are commonly attacked by malicious software that prevents them from working properly. First step in addressing problems with Classpnp.sys file or any other Windows system files should be scanning the system for malicious software using an antivirus tool.

If by any chance you don't have any antivirus software installed on your system yet, you should do it immediately. Unprotected system is not only a source of file errors, but, more importantly, makes your system vulnerable to many dangers. If you don't know which antivirus tool to choose, consult this Wikipedia article – comparison of antivirus software.

Step 2: Update your system and drivers.

Installing relevant Microsoft Windows patches and updates may solve your problems related to Classpnp.sys file. Use dedicated Windows tool to perform the update.

Go to the Windows "Start" menu
Type "Windows Update" in the search field
Choose the appropriate software program (name may vary depending on your system version)
Check if your system is up to date. If any unapplied updates are listed, install them immediately.
After the update has been done,restart your computer in order to complete the process.

Beside updating the system, it is recommended that you install latest device drivers, as drivers can influence proper working of Classpnp.sys or other system files. In order to do so, go to your computer or device producer's website where you will find information regarding latest driver updates.

Step 3: Use System File Checker (SFC) tool

System File Checker is a Microsoft Windows tool. As the name suggests, the tool is used for identyfing and addressing system file related errors, including those related to Classpnp.sys file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the Classpnp.sys file with properly working version. To use the tool:

Go to the Windows "Start" menu
Type "cmd" in the search field
Locate "Command Prompt" result – don't run it yet:
Click the right mouse button and select "Run as Administrator" option
Type "sfc /scannow" in console prompt to start the program and follow the instructions

Step 4: Restoring Windows system

Another approach is to restore system to previous state, before the Classpnp.sys file error occured. In order to restore your system, follow the instructions below

Go to the Windows "Start" menu
Type "System Restore" in the search field
Start the system restore tool – it's name may differ depending on version of the system
The application will guide you through the process – read the messages carefully
After the process has finished, restart your computer.

If all the above-mentioned methods failed and the Classpnp.sys file problem has not been resolved, proceed to the next step. Remember that the following steps are intended only for advanced users.

Download and replace Classpnp.sys file

The last solution is to manually download and replace Classpnp.sys file in appropriate folder on the disk. Select file version compatible with your operating system and click the "Download" button. Next, go to your web browser's "Downloaded" folder and copy the downloaded Classpnp.sys file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of Classpnp.sys file example directory paths.

Windows 10: C:\Windows\System32\drivers\
Windows 8.1: C:\Windows\System32\drivers\
Windows 8: 1: C:\Windows\System32\drivers\
Windows 7: C:\Windows\System32\drivers\
Windows Vista: C:\Windows\System32\drivers\
Windows XP: ---

If the steps did not solve your Classpnp.sys file problem, you should consult a professional. A probability exists that the error(s) might be device-related and therefore should be resolved at the hardware level. A fresh operating system installation might be necessary – a faulty system installation process can result in data loss.

File versions list

Filename Classpnp.sys

System Windows 10

File size 348056 bytes

Date 2017-03-18

Download

File details
	MD5	32be4ba1c8c74f7c8ebf16e07ade73ed
	SHA1	9b15d4a34f106b5a11ea355a3c1899e71807a86b
	SHA256	e0390eca600c7c3a9cd79398a1fff5305598999e8bc25e586e53ceb8f7b6b9f1
	CRC32	08f53465
	Example file location	C:\Windows\System32\drivers\

Filename Classpnp.sys

System Windows 8.1

File size 292160 bytes

Date 2014-11-21

Download

File details
	MD5	8180490bf719facb26468b800f399b8f
	SHA1	63e549938bc7e7d06c6613c5b45d2941f9cc85f1
	SHA256	044f17b7a6d47727d4a9c0ce1245b082c099068aacf7766e9415072991bd53e6
	CRC32	d58fc0a2
	Example file location	C:\Windows\System32\drivers\

Filename Classpnp.sys

System Windows 8

File size 299760 bytes

Date 2012-07-26

Download

File details
	MD5	4b0238aed52a1a5b7d4ddc6009c60285
	SHA1	b2b19b91ec2bc1992ad48839e7279705d698ff57
	SHA256	966adacfef0037de184aa514e9136ebf085330106504c2dc023feb9066510297
	CRC32	b23f8a23
	Example file location	1: C:\Windows\System32\drivers\

Filename Classpnp.sys

System Windows 7

File size 179072 bytes

Date 2010-11-21

Download

File details
	MD5	acfad0b512226c7a83c7cb09fd55a9ad
	SHA1	dbe2e674184248ee0d541e9e5cb9146a5fe40528
	SHA256	f0f1c47cc164b8bf4b99cc4e9c0d34d603051cd01ed369acb9a781ec9cca56aa
	CRC32	a7942a1c
	Example file location	C:\Windows\System32\drivers\

Filename Classpnp.sys

System Windows Vista

File size 164840 bytes

Date 2009-04-11

Download

File details
	MD5	6b6bea1421fc416e35b2d17495380104
	SHA1	e56ac1f302a519579c1da2a1038ec8f0159bfcf6
	SHA256	65509e8545b69bb785a7a38fea8c5ac8f7cad8e5607c02b55407114dc9b27e27
	CRC32	77e5c20f
	Example file location	C:\Windows\System32\drivers\

Filename Classpnp.sys

System Windows XP

File size 49536 bytes

Date 2008-04-14

Download

File details
	MD5	fe47dd8fe6d7768ff94ebec6c74b2719
	SHA1	8c5c77dd926b64574df1d6b8fd03fd8522704aaf
	SHA256	f6da1c222b327198cc316c4ec44f9ecebe1c78ea6adbb3a05456018c9688a4b2
	CRC32	df8b8272
	Example file location	---