Windows-7 system files integrity

Question

Is there a tool that will check integrity of system files in Win7 and search for invalid or changed ones. I would like to find which files were changed by rootkit installed on system. It would be nice if there existed some databases with system files names and corresponding hashes (original and updated by Windows Update).

Solution

Use sfc /scannow command.

This command (System File Checker) scans the integrity of all protected Windows 7 system files and replaces incorrect corrupted, changed, or damaged versions with the correct versions if possible.

You can read this tutorial on how to use it:

How to Repair Windows 7 System Files with System File Checker

Comments

[Kara Marfia]

For every anti-virus measure, there's a virus to beat it (was that Sun Tsu?)

[jet]

some rootkits are installed in user's folder - search under Users for .exe and .dll if any they shouldn't be there. Also check with something like HijackThis to see what is loading during the boot

[watbywbarif]

Although this did not fix my problem it seams like good tool to check system integrity. Thx!