Why does my windows 7 become nearly unusable under heAvy copying like above 10 gb and lots of files eg. Photos from one drive to another. It taken firefox over 3 minutes to load and then crash. Same with chrome or safari. So bad that I'm having to use the ipad to To type this while its copying. Both fast sat 3 samsung drives. 6gb ram and a clocked i7 it shouldn't be happening. Install only 3 week old. All drivers etc. Any ideas what it could be?