When I rebuild my computer, I usually use recovery disk provided with my toshiba which installs XP along with every driver required, me being no expert. A year ago, I tried once starting anew with windows XP cd after a virus infection and blatantly failed

, had to use the recovery disk to get decent operation. You think it's essential I start with win7? 32 or 64 bit? Do I have enough ram to use it? I am already maxed out.
Toshiba Satellite P100, model: PSP3AC-JR500F
x86-based pc
T2400 @ 1,83 GHz
x86 Family 6 Model 14 Stepping 8 Genuine Intel(R) 1,84 GHz,
total physical memory: 4,096 Go
available physical memory: 2,14 Go
Total virtual memory: 3,00 Go
Available virtual memory: 2,96 Go
ACtual Hard disk: 112 Go capacity
Toshiba MK1234GSX
3,00 Go RAM available, 4 Go RAM installed
Do you need anymore info?
Thanks a lot for your time and patience.