Hi
One simply cannot log in. I think the OS is corrupt.You're too much into the windows mindset here.Even if I did know exactly what Ubuntu to download, I`ve no idea how to reinstall it on this thing.
I just sounds like X is crashing and dumping you back to the login prompt which will be GDM under 10.04 (assuming that is what you have).
I would be very surprised if this is not fixable. You should not need to reinstall at all.
There are a many posters already, on this thread already so i'll just subscribe to it for the moment.
Kind regards
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