I know this response is late, I just saw this query. The reason your googlebar disappeared is prolly because you have to turn on the option "ENABLE 3rd party EXTENSIONS" under your Internet Explorer options area.
I had my toolbar disappear and that was the culprit.
To check this go to
TOOLS ==> Internet Options ==> Advanced ==>
... then in this area make sure the checkbox next to
"Enable Third Party Browser Extensions (requires restart)"
Is checked. Then restart your 'puter and the Googlebar should be up there again (assuming you haven't since uninstalled it when you found it wasn't working)