CtrlPlus by Yoji Hagiya will swap the Ctrl and Caps Lock keys in Windows there are versions for Windows 98 and Windows 2000.
CtrlPus is shareware, but is worth its small US$10 registration fee because it not only swaps the Ctrl and Caps Lock keys, it also adds WordStar navigation keys to Word's menus, something that cannot be programmed from within Word and so compliments the WordStar Command Emulator.
CtrlPlus will also add basic WordStar navigation commands to all other Windows programs.
Note: this may conflict with key combinations used within those programs. Therefore, this feature can be turned on and off should it cause problems.