I have several PCs that are receiving this error when logging in in the Results window:

"Could not execute external program"

They're trying to run \\high_school\sys\public\clntrust.exe but are receive the error.

However, they are receiving mapped drives okay and then can run clntrust.exe from the mapped drive.

They have rights and can see the program.

I did push out Windows Updates on Friday. That has been the only real change. I backed those out on my test PC today, but the problem remains.

Client = Windows XP SP3, Client 4.91.SP5

Any ideas?