Yes it is a repackaged Windows Defender although mine did say Microsoft System Sweeper on the window title. It seemed to take as long to load as a Win 7 install from a USB but went quickly to updating, processing and formatting. Too bad it has to reformat with each install, You'll need a separate USB drive for X86 and another for the X64 version.
Yes Aaron, the options will let it exclude drives/folder from the scan.
It took a bit more than 40 Minutes to scan about 29GB of data and the Windows 7 OS. Apparently this has been out for awhile since the help file gives instructions on how to scan a system other than Vista, no mention of 7. Seemed odd for a beta release.
Maybe I'm a little short on basic PC knowledge. When I installed the program to the USB drive, it was "F", and I chose to scan "C". When the scan ran it was scanning drive "E", is this normal? Whatever drive the system boots from is considered C:\?