You should run Windows Update immediately and download all of the critical security fixes. A bunch of Chinese Hackers have released code for a worm to use a specific flaw to wreak havoc, so it'd be in your best interest to close the hole before they start.
Or you can download this specific patch directly (although you should always keep your security patches up to date, all of them!)
Windows NT 4.0: http://microsoft.com/downloads/detai...displaylang=en
Windows 2000: http://microsoft.com/downloads/detai...displaylang=en
Windows XP Home and Pro (32-bit): http://microsoft.com/downloads/detai...displaylang=en
Windows XP 64-bit edition: http://microsoft.com/downloads/detai...displaylang=en
Windows Server 2003 32-bit: http://microsoft.com/downloads/detai...displaylang=en
Windows Server 2003 64-bit: http://microsoft.com/downloads/detai...displaylang=en
Or you can download this specific patch directly (although you should always keep your security patches up to date, all of them!)
Windows NT 4.0: http://microsoft.com/downloads/detai...displaylang=en
Windows 2000: http://microsoft.com/downloads/detai...displaylang=en
Windows XP Home and Pro (32-bit): http://microsoft.com/downloads/detai...displaylang=en
Windows XP 64-bit edition: http://microsoft.com/downloads/detai...displaylang=en
Windows Server 2003 32-bit: http://microsoft.com/downloads/detai...displaylang=en
Windows Server 2003 64-bit: http://microsoft.com/downloads/detai...displaylang=en
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