My Acer Aspire 4738 suddenly started to run really slow

  Not MeNot ME 01:30 11 Apr 2014
Locked

My Acer Aspire 4738 suddenly started to run really slow. Every window I clicked crashed, even explorer.exe. It boots and shuts down way slower.

I tried booting into safe mode and everything went normal there. I suspect my PC got infected by a computer virus (?), but I'm not really sure. What do you guys think?

OS: WIN 7 HOME BASIC

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