1. Go to the Finder
2. Navigate to /System/Library/Extensions
(yes, OS X has extensions, but they're more stable and more rare than the Classic ones...)
3. Go down the list to SideTrack.kext. Select it (one click).
4. Open the menu item File: Get Info (or press command I)
5. Open the disclosure triangle next to Permissions.
6. Under the Owner popup, change the owner from 'system' to 'janmc' (or whatever your username is on her ibook).
7. Authenticate in the dialog that pops up.
8. With SideTrack.kext still selected, drag it to the trash (or press command-delete).
9. Restart.
(Actually, you'll also want to delete /Library/PreferencePanes/SideTrack.prefpane, but this will get rid of the destablizing extension)