I've this problem for a month now, everytime I restart the computer, I get very low FPS in everything, from youtube videos to video games, even my browser becomes a bit unresponsive.
To fix it temporarily (until computer restart), I have to reinstall NVIDIA's Vcard drivers, then I can use it normally.
I have an GTX 650Ti / I7 4770K. Changed to an 560 for testing purposes (from another manufacturer) and the problem persisted after restarting.
Any ideas why? Thanks.
If you have Microsoft Security Essentials (MSE) that is garbage and you need to uninstall it first
go to www.filehippo.com and download / install AVAST! or AVG and have them to a FULL SCAN of your computer.
downloaded and run MALWAREBYTES to run a full scan and clean the PC, Malware is DIFFERENT then viruses
Download Slim Driver and make sure all drivers are up to date.
Download SPECCY and post the first tab here, this will give us also you IDLE temp
Download install MSI Afterburner, then run some games or other 3D apps, if you do crash, what was the temp?
Open the case, use canned air and blow out all the bunnies inside, use a paint brush on the vent , fans, grills, etc.
See where we stand once all these are done. Consistantly people on the forums after running BOTH AVAST or AVG and Malwarebytes have found crap on their PCs doing alot of what you said and were resolved with removal.