Thanks for posting on the forums. The one-year license of the software will have begun when you initially installed the application from the disc. It's unlikely that you'll be able to revert to a full one-year license, as you've already used part of it.
I guess you could reformat your hard disk, re-install Windows, re-install the software from the cover disc and register on the PC Tools website using a different email account. You would then need to use the new license code when you activate the software again.
But that seems like a lot of effort for an additional three months on the license. I'm quietly confident that we'll have covermounted one of the new batch of '2010' Internet Security suites by the time your 244-day license has expired.