Download KEY01.SYS to Fix Errors

Sometimes Windows system displays error messages regarding corrupted or missing KEY01.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 KEY01.SYS file can therefore effect in failed execution of the started process.

KEY01.SYS file Windows System Configuration. The file was developed by Microsoft for use with Windows software. Here you will find detailed information about the file and instructions how to proceed in the event of KEY01.SYS related errors on your device. You can also download KEY01.SYS file compatible with Windows 10, Windows 8, Windows XP, Windows 8.1 devices which will (most probably) allow you to solve the problem.

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

User popularity

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

4 Download KEY01.SYS

4.1 List of KEY01.SYS file versions

File info

General information
Filename	KEY01.SYS
File extension	SYS
Type	Driver
Description	Windows System Configuration

Software
Program	Windows 10
Software	Windows
Author	Microsoft
Software version	10

Details
File size	8960
Oldest file	2008-04-14
MIME type	application/octet-stream

Most common KEY01.SYS file related problems

There are various types of errors related to KEY01.SYS file. KEY01.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 KEY01.SYS file. If you encounter one listed below (or similar), please consider the following suggestions.

KEY01.SYS is corrupted
KEY01.SYS cannot be located
Runtime Error - KEY01.SYS
KEY01.SYS file error
KEY01.SYS file cannot be loaded. Module was not found
cannot register KEY01.SYS file:
KEY01.SYS file could not be loaded
KEY01.SYS file doesn't exist

KEY01.SYS

Application could not be started because KEY01.SYS file is missing. Reinstall the application to solve the problem.

Problems related to KEY01.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 KEY01.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 KEY01.SYS errors in just few steps?

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

KEY01.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 KEY01.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 KEY01.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 KEY01.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 KEY01.SYS file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the KEY01.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 KEY01.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 KEY01.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 KEY01.SYS file

The last solution is to manually download and replace KEY01.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 KEY01.SYS file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of KEY01.SYS file example directory paths.

Windows 10: C:\Windows\System32\
Windows 8: 1: C:\Windows\System32\
Windows XP: C:\WINDOWS\system32\dllcache\
Windows 8.1: ---

If the steps did not solve your KEY01.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 KEY01.SYS

System Windows 10

File size 8960 bytes

Date 2013-08-22

Download

File details
	MD5	9a355b75137e8a5f3c384c999cc6dbbc
	SHA1	2be21636f3c2899f1217c289351b106118a5e197
	SHA256	126a00e34a6516c0d382a221071ab4084031c2a89ccb6144cab960ce1f86ee2c
	CRC32	2b4e36e7
	Example file location	C:\Windows\System32\

Filename KEY01.SYS

System Windows 8

File size 42809 bytes

Date 2012-07-25

Download

File details
	MD5	492090267b9608c62b956cd29be3afb7
	SHA1	53f3215b6ef84ff192c45121c4223e84851321eb
	SHA256	49ebbeee6286bd770c8b5af4e4591e4139f0ba9ef31b48daa43b696c64f0d176
	CRC32	8125c907
	Example file location	1: C:\Windows\System32\

Filename KEY01.SYS

System Windows XP

File size 42809 bytes

Date 2008-04-14

Download

File details
	MD5	582bcdd47cf4b68b5cb528f18e3cb808
	SHA1	a797501235696510d05a2d6cfee9a0a2816d5c57
	SHA256	1bb8e25fea43943ee9bc3f79bd3cea7dcb30480ea34e95e14a4e5ec07aebaca6
	CRC32	a5a2f702
	Example file location	C:\WINDOWS\system32\dllcache\

Filename KEY01.SYS

System Windows 8.1

File size 8960 bytes

Date 2013-08-22

Download

File details
	MD5	9a355b75137e8a5f3c384c999cc6dbbc
	SHA1	2be21636f3c2899f1217c289351b106118a5e197
	SHA256	126a00e34a6516c0d382a221071ab4084031c2a89ccb6144cab960ce1f86ee2c
	CRC32	2b4e36e7
	Example file location	---