Problem is solved! May be someone will come up with similar type of problem, any of the suggestion posted in this thread might work. I hope mods won't delete this thread. ""I don't know whats wrong.. I can't open 'download' folder in my PC. There are some videos downloaded from Youtube.. Some guitar lessons Lol Whenever I open the 'download' folder, indicator shows CPU is being used 100%. And every time I've to restart explorer. I scanned that folder with Avast, it shows no virus. Except formatting, Any good suggestion would be highly appreciated.""