Perhaps you have already resolved an urgent question I was going to post.
Yesterday, I attempted to change my current user profile (OS: Windows 7 Pro, 64 bit) to a normal account, and reserve a separate user account strictly for Admin purposes. This was in accordance with the security alert that TTL gave me yesterday (see his post, above).
The result was this: my current user-profile (operating under “non-admin” restrictions) essentially locked up: all of my task-bar icons froze as blank white rectangles; I had multiple error messages from Windows Explorer and so forth. I was not able to discover a way to resolve this. I do suspect, however, that it had to do with what was probably a very LONG list of file permissions which were no longer available to me under standard-user (not administrator) privileges.
I then attempted to revert to Admin privileges on that user account—the one which I normally use-- but that did not work. In fact, it just seemed to create another layer of problems.
Now, I am not sure precisely sure why all of this occurred, but I do know that I wasted about 3 hours fussing with this, only to have to do a System Restore (reverting to a profile that I had saved 24 hours previously).
I would dearly love to believe that I can merrily continue as before— that is to say, using my Administrator-privileged account for everything I normally do-- as you (mmuetzel) suggest. If anyone has more to say about this, please do.