The main cause of destruction / modification (erroneous) of a file in the operating system (OS Windows XP) are viruses. In most cases, users also have corrupted files on the system, find solution in formatting and / or resettlement operating system. A few days ago I had to solve a problem like this and found a method as effective as replacement, but much simpler and faster.
Replace corrupt system files with the original ones using Sfc.exe ( System File Checker ).
How to proceed? To repair the corrupted files using Sfc.exe Is needed primarily cdthe CPC Windows XP in cd/dvd drive . "Start " , And "Run ... " give the command: "sfc / scannow” (Without "). Scanning starts automatically and corrupt files will be replaced with the original CD. At the end of scanning ... Restart! : D
System File Checker Tool Syntax
Sfc [/ Scannow] [/ Scanonce] [/ Scanboot] [/ Revert] [/ Purgecache] [/ Cachesize = x]
More details about Sfc.exe found on support.microsoft.com (Description of Windows XP and Windows Server System File Checker 2003 (Sfc.exe))