Startup scripts not working
 

On our network we run several VBS scripts on machine startup.These clear old
files, install Quicktime etc and have been working on over 500 PCs for
several years.

Occasionally, one PC will start to generate an error for each one of these
vbs scripts:

Event Type: Error
Event Source: UserInit
Event Category: None
Event ID: 1000
Date: 06/11/2008
Time: 14:11:11
User: N/A
Computer: pc_name
Description:
Could not execute the following script delprofile.vbs. .

I have tried everything to resolve this, and in the last 2 years have only
found one resolution - reinstall windows! These scripts work fine when run
directly on the failing PC, and work everywhere else! The scripts don't
generate any errors, and even if I reduce the scripts down to just one it
still generates the error. No matter whether I run 1 or all 3 I get the
corresponding number of errors.

The only thing I can see that is common is that they are all VBS scripts -
other parts of the startup batch file are running (registry hacks etc)

I'm at a loss now, any suggestions gratefully received?