are you sure is IRPL_NOT_LESS_OR_EQUAL instead ofIRPL_NOT_LESS_OR_EQUAL ,
This issue can be caused by any of the following possibilities:
1.Mcafee VirusScan for Windows NT issue
2.Windows NT 3.51 upgrade from Windows NT 4.0
3.Service Pack
4.Driver issue
5.Hardware issue
or a divice driver try to do something its priority level didnt permit , caused by either (a)bugs in device driver (upgrade device if possible) , (b) hardware conflict (remove any new device).
it might alsobe due to failing or defective hardware. If a Stop message points to a category of devices (video or disk adapters, for example), try removing or replacing the hardware to determine if it is causing the problem.
and Mcafee VirusScan for Windows NT 2.5.1(9607) and 2.5.2(9609) are not compatible with Windows NT 4.0 , Uninstall Mcafee .
If you have upgraded your computer to Windows NT 4.0 from Windows NT 3.51 and have a server with Gateway Services for Netware to Windows NT 4.0 installed remove the Gateway Services for Netware and reinstall the service to resolve this issue.
Earlier service packs may have had issues with the TCP handling and updating the Service Pack will resolve the issue. Ensure you have the latest service pack installed in the computer.
Links to locations to download the latest service packs can be found through our Windows NT download section.
In the event that the above information does not help to resolve your issue it is possible that the computer may be encountering a hardware issue. Attempt to exchange or replace hardware in the computer. Our recommendation would be:
RAM / CPU / NIC