Now I see your problem is unrelated to my post #2.
The error suggests Windows believes another program has hung up, and it needs for you to close it.
Or, because the message is titled 'Server busy', it suggests Windows is confused as to which disk your program/data is on.
Or it is trying to access some other disk but cannot find it.
Or it is detecting a real or false error, having to do with a crash (or incomplete exit) of pspice the last time you used it.
Questions:
Are you running pspice from a thumbdrive/ flashdrive/ pendrive?
Is your data on that type of unit?
Did you install the pspice program directly on your hard disk? Is your data in its folder? Or have you previously navigated to the folder where your data is?
Typical recommendation is to try re-installing pspice.