fixed issue #219
there are a lot of possibilities with the new DSUtils function WriteToRegistryAsAdmin
(instead of regedit.exe it calls reg.exe, because regedit.exe has always the return code 0)

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@335 c2f33eb2-41b2-391d-4cb4-d9d0608729ba