OK - I looked into it, and I don't see where SMAC have a version for Win 7. They do have one for Vista, so theoretically it should work... But... the trouble with theory is if it doesn't work in reality then it's a sh*tty theory...
Couple things you could try from here:
The first is temporarily turning off UAC
while you do the install. Then perform the same steps in reverse to put it back on when you're done.
The second is using the "Real" administrator account
instead of a regular user account with admin priveledges. Understand that enabling this account is the same as running the 'Root' account on a Unix box, and that anything (including malware)
that runs in this environment will have full and completely unrestricted access to everything. I most strongly recommend that anyone using this approach really really should utilize a 'normal' admin account as their default and discipline themselves to *only* using this one when necessary.