It depends on what OS you're using. Nimda always infects a file named
riched20.dll in Win98, which is related to Rich Text document creation.
You can try to get a copy of this file from a same, clean OS and over write
your infected one. But please make sure that your riched20.dll is infected bofore overwriting it. This file is located under \windows\system\
Hope this help.
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