My wife's computer has been running Ubuntu 9.04 32-bit, but now she has 6GB of RAM, so I tried upgrading to Ubuntu 9.10 64-bit. She has a AMD Athlon(tm) 64 X2 Dual Core Processor 4800+ and 64-bit Ubuntu will install, but if I try to use rsync to copy files from my computer, her computer locks up immediately. If I don't rsync, the computer takes a few minutes before it locks up. I also tried 64-bit 9.04 and it had the same problem. I ran memtest86 and it says there is no problem with the memory. what else can I do to figure out what is causing the problem?
note: each install was a clean install and i use rsync to restore her files.