HELP!!!

there is this black window thats pops up with the following message "
C:\WINNT\TEMP\WIN477~1.EXE " and another window with the following message "
16 bit MS-DOS Subsystem. C:\WINNT\TEMP\WIN477~1.EXE, the NTVDM CPU has
encounter and illegal instruction. CS:0534 IP:ffeb OP:ff ee ff 00 00 CHoose
'Close' to terminate the application. or 'ignore' option.

i click 'Close' it closed but randomly the error window keeps popping up
again an again and again...im using Windows 2000, Serivce Pack 4. i used
Trend Mirco anti-virus to scan for viruses but none dectected. the error
window just keep popping up. :(

What seems to be wrong here? i hope some good samaritans can help me out here.
sorry to be such a PC idiot but i hope my problem can be solve.