i had this problem. Create a shorcut for the C

UDK\UDK-2010-02\Binaries\UDKLift.exe.
Right click the shortcut and select properties. Then in the target box under the shortcut tab add "editor" at the end of the text. It should look something like this.
C

UDK\UDK-2010-02\Binaries\UDKLift.exe editor