Windows XP on a friend's PC did not display it's Desktop when switched on. The screen display is blue with nothing showing, even the Start Menu was not showing. He was accessing his files and activating software applications through Windows Task Manager (Ctrl + Alt + Del), clicked New Task button, then Browsed or typed in his files names in. I did a virus scan and found, repaired and deleted 275 Trojan viruses.
I assume his XP's Explorer software component must have been corrupted.
What should be done to remedy this problem on my Friend's PC?