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After you install Windows NT 4.0 Service Pack 4 on a computer running Windows NT 4.0 that already has the Microsoft Windows NT 4.0 Hardware Compatibility Test (HCT) tool (version 8.1) installed, the computer may stop responding (hang).
The HCT tool automatically enables the use of pool tags to track thread memory usage, and this feature may cause a conflict with the Ntoskrnl.exe file.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
152734 how to obtain the latest windows nt 4.0 service pack
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: