You could try an old trick that I used during my tech support days.
You can kill Windows explorer with task manager and then use the File/New Task option to restart explorer with a higher level user. You can then do whatever you need to as that user (e.g. control panel, delete files, add hardware, etc). When you're done, you can just repeat the process and start explorer again as the original users.
I haven't tested 100% in Windows 8 (killing and starting explorer as another user does work), but it should work in Windows 7 and below.
I used this any time right clicking an exe and selecting "run as" wasn't enough
I guess that £29/year is a small price to pay for that kind of feature.