Heavy lags since few days

Zippitt13

Honorable
Oct 22, 2013
2
0
10,510
Hi guys,
3 days ago, i hooked up a second monitor to my computer... Everything was working fine.
Since yesterday, i have solid lags causing crashes and blue screen that "prevent hurting windows".
I finally got over this by running cccleaner and melawarebytes in safe mode. Now i can go to normal mode but as soon as i open Google chrome or itunes... Lags are back ! Really frustrating

(My thoughts : bad sectors on hard drive, graphic driver problem, audio driver problem, virus)

I run : win 7 64 bits
Acer aspire M3910
Radeon HD 5670
6 go DDR3 Ram

Helpp !!!!