I have a Dell Dimension 4300,1.7 ghz,40 gb harddrive,250 mb ram,Windows xp pro.
Could i format it and put windows 7 ultimate on it or will it crash out or go very slow ?.
TIA.
W7 should be taking up about 7Gb (including decent size paging file) and if hibernation is set up. Keep S Restore down to about 10%.
If XP Pro worked ok, it's likely 7 will.
The Windows folder on my W7 Pro machine is just under 9 GB., Ultimate would presumably require more disk space.
It's extremely unlikely that you will get W7 compatible drivers for your laptop, and almost certain that it will not be capable of running the Aero interface, in which case, installing W7 Ultimate would be pointless.