Unable to display the user selection dialog - %1 is not a valid Win32 application

I am trying to set up my laptop to run ASP.NET applications but have run into multiple problems.  I'm using Win XP Pro.  I am having problems updating my database because the aspnet user account does not have permissions to write to the database.  By default XP does not show the Security tab in a folder's properties.  I unchecked the "Use simple file sharing" box and now the Security tab shows up.  But when I try to add a new user to the list this error message pops up "Unable to display the user selection dialog - %1 is not a valid Win32 application".

I can't find anything for this particular error on the web so I'm hoping someone out there in expert land has seen this before.  Thanks.
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Ike23Asked:
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SheharyaarSaahilConnect With a Mentor Commented:
Hello Ike23 =)

hmmmmmm try this, may be can work !!

goto Start>Run>type Sfc /PurgeCache (hit enter and let it complete)
then
goto Start>Run>type Sfc /scannow    (hit enter and let it complete)

restart and now check if any progress ??
Good Luck :)
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Ike23Author Commented:
That worked!  How'd you get so smart?  Thanks a ton!

Tim
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SheharyaarSaahilCommented:
lol..... by hanging out on EE and all over internet for researching on computer problems !!  :)
Glad it worked for u, Cheers ^_^
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misulacheCommented:
dear SheharyaarSaahil, if i run sfc /purgecache, sfc asks for win install cd; but i have sp4 (for w2k)

should i insert the install cd?
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