I had 2010 installed and working, but for college this year i need revit 2011, i downloaded it off the autodesk site and when i try install, i get this error

http://i.imgur.com/FdmT7.jpg

I installed it on a laptop no problem, but i can't install it on my PC, anyone got any ideas?


ps i dunno if it would matter, but i uninstalled 2010 first