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I'm trying to install Ubuntu 9.04 64-bit version on VirtualBox, running in Windows XP. My PC is Dell Precision M2400 with Core2 Duo P8600. After booting VirtualBox from Ubuntu ISO image and selecting the language and "install Ubuntu", PC reboots.

I've tested with different BIOS parameter combinations, but it didn't help.

Host OS is XP SP3 32-bit, and VirtualBox v3.0.8

Did you check the 64bit requirements from the FAQ?

vbox4me2 wrote:Did you check the 64bit requirements from the FAQ?

What FAQ do you mean? At least the user FAQ doesn't really talk about 64-bit requirements. However, I installed VMware server 2 and with that I successfully installed Ubuntu 64-bit without any other changes in my system.

Read the Forum FAQ for 64bit Guest issues and requirements. Vmware ain't VBox.