For freedom 2009, use:
msiexec /x {196AD67D-9180-4A8C-BE53-E7C68D80AE33} /qn
Manage 2009:
msiexec /x {14779493-131D-4BAA-B87F-2999B347F6A9} /qn
Simulate 2009:
msiexec /x {2157BA66-9FE0-4EA6-BD77-34A2128567AB} /qn
Review 2009:
msiexec /x {394CF30B-538C-4ACF-8BA8-D72BAB107031} /qn
2010 is more complex...
Andy
Autodesk Employee