I have Toshiba (A205-S5871) laptop which runs windows Vista SP1 home edition. Three days ago, it starts to show unusual behavior: 1) Eats up 96% of memory even when no program is running 2) Busy CPU up to 99% 3) Opens too many program/window which shows nothing I booted in safe mode and scanned the computer using free versions of Avira and AVG. Both anti-viruses could not detect any virus. AVG reported files which it says are locked and could not be scanned ( around 15-20 files/folder). I then tried to restore and it completed successfully, but the computer still failed to start. Here is the problem: the computer starts to boot properly and it show login screen. After password entry it displays welcome screen and stops showing normal blue screen (not error screen) after that. The hard disk looks busy for few minutes as if it is loading. It doesn't accept any input even pressing power button is not effective. What do you advice me? I have Ubuntu Linux on second partition but could not open the windows partition because it says windows is not shutdown properly (button press for four seconds). Besides Ubuntu is weird to use. Any suggestion please?