Issue
When running TAC Vista as an application it is not possible to start it as it can't find the files PLPSU.DLL and PLSERV.EXE.
Environment
TAC Vista 4.XX
Cause
A antivirus program called Avast have blocked PLPSU.DLL and PLSERV.EXE.
Resolution
Don't use this antivirus program when running TAC Vista or mark the files as safe in the antivirus program.