When uninstalling or repairing a Red Gate product through the Add/Remove Programs control panel on Windows Vista, the following message may be displayed:

This is caused by a bug in the Windows Vista operating system. The message should be displayed when installing packages that have not been digitally signed. However, it is also displayed when uninstalling or repairing previously-installed Installer packages that have been digitally signed.

To work around this issue, click Allow in the User Account Control dialog box. The uninstall or repair operation will continue.

For more information, see: http://support.microsoft.com/kb/929467/en-us