I do this at Circuit City to keep their machines folding without having to go to all the trouble of installing a service.
Here is what I do step by step..
First...I get the toolbar installed (you can skip this since you have already done it)
The toolbar by default doesn't come with Google Compute...so you may have to install that. Just do a search for 'google compute' on google and the first thing that comes up should be what you want. Get that installed.
Now enable the toolbar in IE and turn off the computing part of the toolbar. I.E. Click on the helix that's on the toolbar and select "stop computing" or something similar to that.
Now open up the registry and do a search for 'google'. In XP what comes up should be a folder in HKEY_USERS\a bunch of fairly random letters and numbers\Software\Google. Now, there is a sub-directory of Google called DcClient, click on that and you should see in the right pane of the registry a bunch of keys and values.
Now that you're in \google\DcClient, you need to look for 2 keys. One is called "dc-username" and the other is called "TeamNum". Double click on "dc-username" and change the value to your F@H username, then hit OK. Then double click on "TeamNum" and change it to 93 and then click ok. Now you're done with the registry.
Now, go back to IE and re-enable google compute...and you're DONE!
~FA