Can only agree with -pops- ..... By coincidence I installed my old Wacom pen (serial port, not USB)on a recent Win98se only this afternoon.
The installation procedure offered USB or Serial and then either say which com. port or let the program find it.
I opted for this one because I know my modem is Com4 and sure enough the tablet was installed on Com1
You say you havechanged the Modem. From my experience the Modem and Sound card have always been the most awkward, unforgiving and downright ockard things to install.
I suggest you uninstall the tablet, reboot and wait until Windows asks for the software, feed it your CD - and see what that does!