Message when bringing up Autocad Architecture 2011

[cfhubler]

"Unable to run AutoCAD. This may be due to the following reasons:

1)This version of AutoCAD was not installed properly. In this case, you may wish to reinstall AutoCAD.

2)You do not have sufficient rights to run AutoCAD."

I have tried reinstalling and still get this message when I try to bring it up and it just worked last week... any solutions???

Thank you...

[hashim.mundol]

this is usually related .net framework installation

if on win 7 Please try this 

http://upandready.typepad.com/up_and_ready/2011/07/net-framework-errors-and-windows-7-autodesk-2011-...

if not please cleanly uninstall and install all existing .net framework