Hello,
There are many cases of a computer slowing down even to a crawl. As well as freezing, programs crashing etc.
The first is spyware and virus's. These two things can be eliminated by using some free removal tools that I personally use myself.
Anti-Virus: AVG Free EditionAnti-Spyware: Malwarebytes Anti MalwareYou can use your own if you already have software installed. If you already have anti-virus software installed you would have to completely remove it before installing AVG free, or it could cause problems having two anti-virus programs installed.
The second cause is junk files and a damaged registry, I recommend one program that is also free that will fix both of the above problems.
Click Here to Get CCleanerRun these programs and complete the scans while rebooting your PC before using the next program. This will allow your PC to finalize any changes made by the programs themselves.
You can also remove programs that you don't use to free up harddrive space.
Thank you for choosing Fixya.
-Daniel