You posted in Windows 7, so assuming this is for Windows 7.
Go to ORB, start to type Restore Point. Use System Restore to 'go back' to before this occurred.
Once the system is restored, do the following basics:
Did you install all Windows Updates? Including OPTIONAL except BING? Check them and repeat till ALL are installed.
Download and run Slim Drivers, install all the latest updates but you don't need to reboot until you do the last update
Download Malwarebytes do a full system scan (AV doesn't pick up alot of malware) - this resolved almost ALL other similiar posts to date as most had Malware the AV didn't pick up.
Remove whatever AV your using and go to www.filehippo.com and download AVIRA, AVG, Comodo or Panda and do a full system scan - this repeatedly has resolved alot of people issue relying on MS Essentials.
Repeat the AV/Malware scans till the system comes up clean.
Download and run SPECCY, copy and paste the first tab to show your SPECS
Use Can Air dust out the bunnies and paint brush on the vents, coolers, fans, etc.
Go through and provide a response on each point, don't SKIP IT because "I ALREADY DID IT" , just try doing it again as of THIS post so we know NOW what is happening as compared to BEFORE you posted.
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