hey andy..... was it a quotecenter version of 9, such as 9.1 , 9.2, or v10 by any chance.....
before you go too far on the uninstall/reinstall , first try to use system restore..... restore to any day prior to the v9 attempt...... if that restores version 8, backup the entire C:\Program Files\equis folder.... the entire folder.....
sounds like you have a partial install of v9 that has not uninstalled..... holler back if still a no go.....h