First when searchqu running since startup disabled through msconfig. disable Data Manager.
Then try to remember the last addon is installed, or look in the program files looking for the name Windows Searchqu Toolbar or use the search on "searchqu". then Unistall
another way, in firefox
click on Tools-Options-General-Manage Add-Ons and uninstall DataMngr search.
goog luck do not be too often is not recommended to install the addon.
That's some tips How to remove Searchqu..