Ah, that's an issue that the display driver has when the system switches to Secure Desktop during privilege elevation. The ATI drivers on my Tablet PC deal with this much better than the NVIDIA ones on my desktop do.
Until a driver update fixes this, there's a workaround you can use. Hit Winkey + R and enter gpedit.msc in the Run box. Now, in the Group Policy Editor window, expand Computer Configuration > Windows Settings > Security Settings > Local Policies, and select Security Options. Then, in the right-side pane, scroll down and double-click the "User Account Control: Switch to secure desktop..." item and set it to Disabled.
This, unfortunately, disables a good security feature, but it's the only workaround until we get updated drivers that fix the flickering issue.
Does this disable "getting permission" to install things and to make changes to my system? Boy thats annoying as hell... If I want to change the resolution or whatever I should click apply and that's it.. I don't want you need permission.
gpedit.msc doesn't work when type into the "run" window. I can't locate Group Policy Editor.