Go to Start> Run and type sfc and press ENTER.
Here click Settings and select the option "Check for deleted files". Then click OK and the clikc Start to scan the system. You may need the Win98 SetUp files/CD to restore any corrupt system files.
Also, update the Adaptec ASPI layer.
*www.adaptec.com/worldwide/support/...duct/ASPI-4.70&filekey=aspi_471a2.exe&sess=no