Windows 7: Computer randomly freezing, Ctrl+Alt+Del does not work.

Recently, my computer has been randomly freezing after long hours of usage. Ctrl+Alt+Del and other keyboards and mouse controls do not work when it happens.

Previously, avast have detected a rootkit infection and have it removed. Strangely, this erractic behavior still continues. My scan with Malwarebytes and Avast right now shows no threats.

What other possible causes could it be?

Please provide us with your Event Viewer administrative logs by following these steps:


Click Start Menu
Type eventvwr into Search programs and files (do not hit enter)
Right click eventvwr.exe and click Run as administrator
Expand Custom Views
Click Administrative Events
Right click Administrative Events
Save all Events in Custom View As...
Save them in a folder where you will remember which folder and save as Errors.evtx
Go to where you saved Errors.evtx
Right click Errors.evtx -> send to -> compressed (zipped) folder
Upload the .zip file here.