Windows 7 Run as different user Explorer.exe, Opens as current profile

I have multiple accounts under several domains.
I often need the ability to run as my other accounts for admin/access ability

typically, I do this without an problem. It is only with 1 out of 20 computers I deal with on a daily basis and ironically my own.

To access my different usernames I do:
Shift right click on CMD.exe and select "Run as different user"
in cmd, type: "explorer" / "explorer.exe" / "explorer /separate" "Control" and so on. (on a non affected computer, this works like a charm!)

Once the Window has separated/launched Explorer.exe, it should open as the secondary user name I was promoted for. However, it will simply separate as the current user (What I logged in onto Windows)

I have tried many other ways, run in cmd:
"runas /user:domain\username"
"explorer"

or

runas /user:domain\username "C:\WINDOWS\explorer.exe /separate"

no change

Please help, it such a pain having to constantly log off to access the needed account for a second and then go back.

Again, I don't get any errors while separating, the window separates just fine. CMD takes my password fine and it acts as if cmd is under that different user. But it really inst. Once in Windows explorer, I can still see the desktop from the Current user logged onto Windows, when in fact, I should be seeing the profile from that other user.