Are you attempting to run the workstation setup from the Softrak\ALLWKST folder?

I've seen many sites where this "All Workstation" setup (which allows you to do workstation setups for all modules from one spot) gives report drive errors incorrectly.

If this is where you are, try running the workstation setup from the \Softrak\QIWIN\WKSETUP folder instead to see if it works from there.