where'd the other sidebar go?

when i first got my computer i had sidebar that let me browse through lots of
gadgets and things, then i went to windows & downloaded a xm radio gadget and
it completely changed my sidebar. i want the default sidebar back, those
gadgets were better! i can not find out how to delete the xm radio i
installed. i can remove it & thats it. ive looked everywhere...
someone help!
do i have to reinstall something? please help!