If you want to delete themes in Windows 7, you can use the following steps:

  1. Open the Start screen and type “cmd” (without the quotes) and hit enter.
  2. Type “netstat -a” and hit enter.
  3. Look for the “TCP/IP” line and look for the “state” column. If it’s set to “down”, then your theme has been deleted; if it’s set to “up”, then your theme is still active but has been hidden. If it’s not set, then your theme is still active but has not been deleted yet.