is there a problem if?

User.exe is not a valid system file

Just a point of clarification.

Answer one was incorrect.

User.exe is a core component of windows and in general does/not should not be changed unless there has been some significant OS upgrade since last running SFC.

Before accepting the update option I might suggest looking at the user.exe in windows\system and compare it to windows\options\cab (as this is the base copy). If they are the same update, if not then I would say restore it.

Please read Technet article Q192832:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q192832
(please remove any spaces)

"When you use the System File Checker (Sfc.exe) tool to restore a Windows 98 system file (for example, the User.exe,Gdi.exe, Setupx.dll or Krnl386.exe file) from a Windows 98 cabinet (.cab) file, the wrong version of the file may be extracted from the Mini.cab cabinet file. This can result in the inability to start Windows 98 (for example, your computer may stop responding) or "Windows Protection Error" error messages in normal and Safe mode"

hope this helps

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