ISA Client uninstall

I have a user that has the client loaded for our ISA server but still
can't surf.  She has the necessary rights to surf.  I try to reinstall the
client and it tells me it finished wiht errors.  I try to remove it and
get a message stating that a "Fatal Error Occured During Installation". 
Is the another way to uninstall the client without going through the
Add/Remove Programs or the install program?


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