2 questions on Defraggler usage

In Defraggler...can you:

1) continue working while Defraggler is running as you can with Windows defragging ?

2) Is there any harm and/or benefit running Defraggler as Administrator ?

Running Win 7 Pro 64bit

Thanks....Tim

Defraggler will run in the background, you may find your PC slightly sluggish but not impossible to use.

It's always best to run Defraggler with Admin rights because guest accounts are limited to access of their own files.

Richard S.