Vista Interactive Services Dialog caused by Symantec Endpoint Protection

When a user attempted to install the newest update to symantec endpoint protection (ver 11.0.2), he began recieving interactive services dialogs that said the product was uncompatible with vista.  I attempted to uninstall version 11 (it hadnt been replaced) and reinstall the newest version (11.0.2) and recieved a runtime error during the install.  The runtime error said that the program (C:\Program Files\SymantecAntivirus\SMC.exe) had requested the runtime to terminate in an unusual way.  When I closed the error, the install finished.  When you tried to open symantec, another error popped up that said "CMC SMC stopped working and was closed.  A problem caused the application to stop working correctly.  Windows will notify if a solution is avaliable."  When I rebooted the machine, the DKservice.exe stopped working and was closed and symantec antivirus/antispyware protection was disabled.  The auto-protects for email and file system were not functioning correctly AND on top of this, I am still getting the interactive services dialog every couple minutes.  
I will be placing a call to symantec too, but I was wondering if anyone on here had any ideas.
SUNYESFAsked:
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SUNYESFConnect With a Mentor Author Commented:
I went back in an turned off the user access controls to the machine and symantec seems to run perfectly.  I think something with those controls was blocking the program.  Still cant figure out why I would have gotten a message that said the program was incompatible if it was simply being blocked.
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