License Key error... can't register PC-cillin 2002

When you register you software and receive a License Key from the Trend Micro Web site, an error message may appear:

This may have occurred for the following reasons:

• If you accessed the online registration site from a different computer, please try registering again from your own computer. A License Key is created using a combination of your computer information and your PC-cillin serial number.

• You may have mistyped your License Key. Type your License Key exactly as it appears. License Keys are case sensitive.

• If you re-installed your operating system, you must re-register PC-cillin. You have to get a new License Key from the online registration site.