Computer Freezing whenever browser opened and get stuck sometimes due to undetectable virus

[Manish]

 I know my system got infected with a virus, but I don't know how to get rid of it. The virus makes my computer freeze up and gets stuck whenever chrome or Mozilla firefox browser opened and it affected internet explorer also. I have tried reinstalling them. Still same no improvement. I've noticed that after the freezing starts, it doesnt seem to stop until I restart my computer or I have to wait and end that task. I've done the quick and full scan 3 times each now, ran cc cleaner and even an Quick heal and HitmanPro scan. Nothing seems to work, and I need help. I've experimented some and found that I don't seem to start freeze unless I open a brower and surf the web. According to my processes tab, nothing out fo the ordinary is causing these freezes, so I am truly baffled. Please help me if you can. Thank you !!

 

System Specification:

Lenovo Z50-70 Laptop

Windows 8

Intel core i5 with 4GB RAM

[AdvancedSetup]

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