What, you want to uninstall it? Gigabar rocks.
Anyway. Close gigabar (goto the clock/date icon, tap and hold, then click close gigabar). You can then syncronize and goto tools, add/remove programs and remove Thumbs Up! GigaBar (and probably) Thumbs Up! gidgfold and Thumbs Up! gidgesta.
Are you going to be using WisBar or something else? I couldn't live w/o a task switcher, and Gigabar just rocks. 🙂