Hi Rebpiz,
In addition to what tom982 has mentioned, check in safe mode, please refer following link to get into safe mode with networking:
http://www.vistax64.com/tutorials/123496-safe-mode.html
If issue persists, perform System Restore (only if Software Configuration Changes were made)Refer the link for your reference:
System Restore - Microsoft Windows
NOTE: With system restore you will not lose any data from the computer, any new programs installed in the computer you would need to reinstall the programs back on the computer.
Kindly let me know the results.