I'm still not entirely sure what program you are referring to when you talk about "the mediagrabber".
I've gone back (based on the date of your original post) and as best I can determine, the program you are referring to is "Web Stream Recorder Pro" by Sytexis Software.
The original giveaway was held on October 2, 2007
http://www.giveawayoftheday.com/web-stream-recorder-pro-20/
The program when started prompted users to downloaded a newer version (which veteran GOTD users would know reverts the program back to a trial version).
This is probably what happened to you.
Then on October 16, 2007 a "fixed" version was offered.
http://www.giveawayoftheday.com/web-stream-recorder-pro-20-rerun/
If you had got the giveaway on October 16 - you problem would've been fixed. Now as that giveaway is over, your options are limited.
Perhaps contact Sytexis - http://www.sytexis.com/contact.php
Sytexis might have the fixed Giveaway version still available that you can install over your existing copy. But there are no promises - providing this fix for you is entirely up to their good nature.