oh wise internets, pls can you answer my question?

I have windows xp on my machine. Last week while on the phone with AT&T regarding my (formerly SBC/Yahoo) internet service, I tried inserting the old SBC/Yahoo install disk. It popped open a window that failed to populate (remained empty) and otherwise seemed to demonstrate a failure to work, so I tried to shut down the program and, failing that, ejected the disk.

Now every time I turn the machine on, I get a pop-up from the "SBC Yahoo! Reboot Helper" that says "Please insert your SBC Yahoo! DSL Installer CD back into the CD tray."

I can try that but I seriously doubt it will work - I expect it to just hang again. Any ideas on how to make this message go away?