my pc has got slower recently, only noticed it a couple of weeks ago, last night it locked up, after a cold reset it froze again. i use ccleaner once a week, router firewall nod v3 installed since 621, and spyware blaster, i downloaded a squared last night also spyware blaster and ran in safe mode, both found nothing. i tried all kinds of things to try and get my system running well again all to no avail, i installed nod v2 again and my pc is back to its fast self again? its a dualcore pc 2 gb ram. but after reinstalling v2 it was like a new pc again, any ideas? should i have emptied the cache? it's puzzling me, v3 slowly but surely ground my pc down and i have no idea why?