Microsoft has released a patch that eliminates a security vulnerability in Microsoft�?????�????�???�??�?�® Windows NT�?????�????�???�??�?�® 4.0 and Windows�?????�????�???�??�?�® 2000. The vulnerability could allow a malicious user to make some or all of the memory on an affected server unavailable, potentially slowing or stopping an affected server's response time.