BSOD

A NT 4.0 workstation just suffered a BSOD. Now, after rebooting, everything he types in Word 2000 disappears once he presses the return key (but wordpad works fine). But, if he backspaces, they reappear. Exisitng docs open fine, but the minute youpress the enter key, everything disappears. Also, IE 5.0 brings up blank pages. Parts of the Outlook 2000 Outlook Today screen don’t appear as well.
Help!