Microsoft has admitted that users who installed the security patch for Windows 98 and ME in January are suffering from slower machines or frozen screens as a result.
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The MS05-002 patch was issued by Microsoft for the Windows 98, Windows 98 SE and Windows ME operating systems as part of its monthly patching cycle.
The problem relates to the way the Internet Explorer browser works with the operating system.
Removing the patch returns the machine to normal performance but leaves users open to security vulnerabilities, although Microsoft said it had not yet received any reports of exploits of these vulnerabilities.