Think I might know the source of the problem.
If you are using a limited-user account this is to be
expected, as the program is currently a single-user
application. The reason for this is simple. Since MS
bought out Giant Company to acquire Giant AntiSpyware and
released the beta product only 21 days after acquiring
it, they didn't have enough time to convert the
application from a single-user to multi-user. The amount
of coding involved is mind boggling. Even small apps can
take up 1000 lines of code. The code for MSAS is likely
10 - 1000+ times that. Not to mention that they are
likely changing the source code from Visual Basic to C++
or even C# (likely .NET). Making all of those changes
and alpha (pre-beta) testing it will take months.
We might see multi-user support in Beta 2, likely
sometime before the end of the year.
Alan