"Error loading 1st.qst" internal error in ZC 2.10

I have a "Error loading 1st.qst" internal error in ZC 2.10 when I try to use it with a different user then the one that intalled it on the PC. Also, the first screen after the splash screen is all black.

I run Win XP Pro SP2 on my machine. I used an Admin account to install it but I can not run it using a regular user account - It does work with any Admin account on the machine.

I applyed the "compatibility security template" on the machine to fix issue with old (non XP "certify") softwares and games but it does not fix the issue for ZC 2.10

Any idea anyone ?

Thank you