Permissions issues with FileExists

[cshbell]

I'm creating a script that will be run by users with Administrator privileges:

RunAsSet("Administrator", "DOMAIN", "password")
If FileExists("C:\WINDOWS\$NtUninstallKB917013$\spuninst\spuninst.exe") Then
Run("C:\WINDOWS\$NtUninstallKB917013$\spuninst\spuninst.exe /q /norestart")
EndIf
RunAsSet()

I only want it to trigger if the package is actually on the computer, hence the If FileExists. however, the file that I need to use for determining whether or not the package is installed (spuninst.exe) is in a location that a user without Administrator privileges does not have access to. Therefore, the If FileExists assertion fails, because (I assume) the If FileExists is being executed with the user's default privileges and not the escalated privileges used by RunAsSet.

So my question is, is there a way to perform the If FileExists check with escalated (e.g. Administrator-level) privileges?

[PsaltyDS]

Please try to avoid double posting.

...and thank you for your support.