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You are probably going to need to reinstall it.
uninstall, then go in to the cd and right click the setup.exe and set it to the windows 98 compatability mode like before, then install it and then try the compatability mode on the games .exe again.
Other than that theres not a whole lot you can do, maybe check forums that are just about rogue spear and use the search function to look for people with the same problems and see if they managed to fix it.
I can't guarantee this works but it seems the most likely way, also doing a check disk of your hard drive would be a good idea but it takes some time.
Also if you need help don’t Spam the forums as people are unlikely to bother, one topic is enough.
Hope it works if not post again.