What operating system are you running? Sometimes with an older tablet and a newer OS, there can be compatability issues. Installing/running it in a compatibility mode for an older OS could help solve the issue. There may be an error in your install disk, wacom keeps installation drivers for all their products available on their site, using that may help.
Thank you for bringing up compatability! I was able to fix the problem by downloading an older driver on the site that would make my tablet compatible with Windows 7, as the driver I had previously downloaded did not do that.