What operating system do you use?

[Alby_da_Wolf]

Desktop: Dual boot Kubuntu 8.04 + Windows 2000
Notebook: Dual boot Kubuntu 8.04 + Windows XP Pro

I normally write here from Kubuntu on the notebook, the desktop is slower (excluding HDD's), with less RAM and single core, when I open too many tabs on FF it slows too much.