It sounds as if your uninstall failed as the Project Cooper uninstall does remove all files and registry entities when completed successfully. A copuple of months ago we posted a quick fix to this situation as it was encountered by a number of users. We're sorry that it happened - it has been fixed for our next update and you can quickly rectify the situation by doing the following -
You can uninstall Cooper simply by inputting below command in Start -> Run:
msiexec /x {5783F2D7-9031-0409-0000-0060B0CE6BBA}
Again, sorry that your uninstall failed.
Lisa
Lisa Crounse
Product Manager
Lisa Crounse
Sr. Product Manager