im looking to install 10.04 over top the 11.04 partition, it wouldnt let. keeps giving me a "root file system not found" error ever time i manually select partition. (i have a win7 partition) 11.04 popped up after upgrade that my hardware isnt supported for unity. and i cant boot into it, hangs up on purple screen right after boot menu.

if anyone can post a link to a how to guide or put it on here, would be great?

im trying to take advantage of my nvidia geforce gt 120m (its a laptop) to play around with cuda/c++ programming!