WinZapper
What is WinZapper?
WinZapper is a tool with which you can erase event records selectively from the Security Log in Windows NT 4.0 and Windows 2000.
How do I use this tool?
Download the zip file and extract the files in it. Run winzapper.exe and mark the event records to be deleted, then press "Delete events and Exit". Next, reboot Windows to re-enable the event logging system. (You can't use the Event Viewer again before rebooting.)
Which OS's are supported?
Windos NT 4.0 and Windows 2000.
What if there is a problem?
Then check out the WinZapper FAQ.
Warning!
There is a small risk that this program corrupts the event logs so they must be cleared completely.
So where can I find the zip file?
You can download it right here.