In response to vivek, You might want to check this link I pulled up from Inventor's site.
http://usa.autodesk.com/adsk/servlet...&siteID=123112
I am not a fan of the most recent versions of Inventor. If you are worried about whether or not your computer can hold it. You can reduce most of the requirements if you cut back and go for Inventor 8.
Check
http://www.amsystems.com/products/me...emRequirements
I would not necessarily suggest this for competing for the Inventor award. But, If you just want it for design reasoning and dimensional decision making(like I do). Inventor 8 is good enough. Besides, just because your computer can handle the newest version doesn't mean you want it to be slowing things down so much.
Note: Inventor 8 is not probably Vista compatible. Not sure though. Could someone let me know? I would appreciate the info.
Well, vivek, I hope this helped you.