Sounds like you maybe infected, or the HDD is faulty. Personally I would do the following first:
Download and run SPECCY, copy and paste the first tab to show your idle temps
Get Can Air dust out the bunnies and use paint brush on the vents
Did you install all Windows Updates? Including options except BING? Check them and repeat till ALL are installed.
Download and run Slim Drivers, install all the latest updates for alot of the other things 'under the hood' the video card interfaces with, but you don't need to reboot until you do the last update
Remove whatever AV your using and get AVIRA http://www.avira.com/en/download/product/avira-free-ant... (or go to www.filehippo.com and download Comodo/Panda or AVG (AVAST! was hacked so I don't recommend them anymore)) and do a full system scan - this repeatedly has resolved alot of people issue relying on MS Essentials.
Download Malwarebytes do a full system scan (AV doesn't pick up alot of malware) - this resolved almost ALL other similar posts to date as most had Malware the AV didn't pick up.
Repeat the AV/Malware scans till the system comes up clean.
After all this is done (since we do not know your system nor know if all this was done since the 'problems' occurred) and let us know the status of each of these. PLEASE DO NOT SKIP ANY or tell us 'you did it before', we are addressing this issue as it is right now, so let's do them 'again' if necessary just to make sure nothing got 'in' / messed up before you posted to Tom's.
Last thing would be to contact Acer / get receipt and bring it back advising them after all these steps to prove it wasn't' something (but the email said I love you how was I to know it was a virus) you did.