This problem has never been encountered because the JCS 94 group doesn't own Windows 98 (at least I never heard anyone complain, so I assume this is true). I own Windows XP. The problem may stem from the installation, which has been removed from the current version. The files from the new version are mostly the same except there is no installation file for people to slip up on. This will be looked into, but, in all honesty, JCS 94 can't harm your system unless you try and feed it a file that's not a level or a tileset (the former possibility is removed in the upcoming version). If the installation caused problems, I'm sorry for that. The matter will be looked into.