I just installed Ubuntu 13.04 64. The HD was clean and nothing was on it when I did the install. I have Windows 7 installed on another drive and it runs smooth. The problem I'm having is it is running very slow, freezing on me and taking a few minutes to load. I had 12.04 on the same comp and it ran fine.
Memory -2.0 GiB
Processor - AMD Athlon 64 Processor 3700+
Disk - 115.9 GB
Graphics - gforce 7900gt 256bit nvidia