How do i repair Windows XP without the disk?

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User Agent: Mozilla/4.0 (compatible MSIE 8.0 Windows NT 5.1 Trident/4.0 BTRS130169 .NET CLR 2.0.50727 .NET CLR 3.0.4506.2152 .NET CLR 3.5.30729 .NET CLR 1.1.4322 yie8)Timestamp: Sun, 3 Feb 2013 13:58:22 UTC

Message: Syntax errorLine: 1Char: 1Code: 0URI: http://support.microsoft.com/common/surveyscripthandler.ashx?template=trigger&ampCallbackId=0&ampSite=MSAnswers&ampRegion=en-US&ampContentId=&ampContentType=&ampGroup=&ampKeywords=&ampLastReviewed=&ampTechnologies=&ampTitle=hoe%20do%20i%20repair%20windows%20without%20the%20disk%3F%20-%20Microsoft%20Community&ampUrl=http%3A%2F%2Fanswers.microsoft.com%2Fen-us%2FSearch%2FSearch%3FSearchTerm%3Dhoe%2Bdo%2Bi%2Brepair%2Bwindows%2Bwithout%2Bthe%2Bdisk%253F%26CurrentScope.ForumName%3Die%26CurrentScope.Filter%3D%26askingquestion%3Dtrue%26tm%3D1359899722140&ampReferringUrl=&ampFollowup=&ampHistory=st%3D%7C13310%7C13311

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