toshiba computer with ubuntu on it.

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http://www.ubuntux.org – i got a toshiba. with vista on it. D: vista froze during an update and quit working so i but ubuntu on it. karmic koala. now ubuntu has quit working it won't boot. it brings me to a list of different modes and recovery modes i can use. and when i try any of them, the get stuck and just dont load. the regular ubuntu just goes blank after being stuck at the logo for over 30 seconds. ANYWAY! i want to put vista back on because nothing i do with ubuntu seems to be working. but my recovery discs arent doing anything! is there (Distributions)