Sonic can be a lot of things, depending on the full name and the publisher. For instance, there's Sonic RecordNow (CD/DVD burning software), Sonic the PDF creator, Sonic the video game, etc. What we need from you is the full name of the software, the publisher if available, where you found it on your computer (was it in add/remove programs or in a folder), etc. If it was in Add/Remove Programs, and assuming youre using Windows XP, you can click the entry, then click "click here for support information" in order to find out more about the program. If you found it anywhere else, right-click the program and select properties for additional information, then post back here.

Let us know.
John