Issues with what Microsoft calls "a small fraction of the downloads" made of a Windows 2000 SP4 update have prompted the company to re-release the update for the operating system. Some of those problems involve connecting to servers running Citrix, as well as some third-party security software compatibility issues. Microsoft will post a new version of the update rollup soon.

"To date, we have had several million downloads of the Update Rollup 1 for Windows 2000," Peter Houston, a director of Windows servicing strategy, said in a statement. "We're seeing some issues with a small fraction of the downloads."