A few things to try in this situation:
1. I noticed the install path was a non-default path. Try uninstalling, deleting all temp files from this afforementioned path folder (and the FPSC folder itself), then reinstall and leave the default alone, ie (I:\Program Files\The Game Creators\FPS Creator\). Perhaps even the C drive if you have the time for many experiments.
2. DirectX 9.0c, 3D Card drivers and non-conflicting system drivers are all vital to smooth running of this software, so spending an hour to make sure your system is completely up to date is useful to discount these possibilities during your test, and also will help the rest of your system when doing other things too.
3. Any background tasks that are running such as virus defence and firewalls are vital, and there are others such as music playing tools, display monitoring tools and download managers that are not vital. Disable as many non vital tools as you can so you know the only thing the processor is doing is critical work and the software you want to use.
4. The problem in this case sounds familiar to similar problems that relate to what we have termed 'missed messages'. Instructions from one part of the software to the other, which for some reason are missed on some systems. This could be due to processor load, system efficiency, how fast the memory is, how much safeguard software is running on your system, etc. Removing EVERYTHING from the processor (including anti virus software) is a more dangerous test, but more conclusive. I recommand if you try this step, to physically disconnect from the internet, try the software, then do a full virus detection before and after reconnecting your internet service. I would hate to mess someones system up with this last step of advice so please use your own judgement here.
I am dealing with one or two cases of this, and attempting to get a picture for the true reason, so hopefully a fix will not be long. Thanks for your help!
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