It’s a transitional period for computers at the moment.
With Windows 7 coming along, 64 bit computing is becoming mainstream.
A 32bit operating system can only “see” 4GB RAM where are a 64bit version can use a lot more.
The amount of RAM that can be used is limited to what the motherboard can support. Most current notebooks/laptops can only support 4 GB RAM so buying a 64bit operating system isn’t a huge advantage.
Buying a new desktop computer is different. Systems we are supplying support 8GB RAM. Shortly we will be supplying systems that can take a whopping 16GB RAM.
The downside to 64bit is hardware drivers, particularly for printers and scanners.
However is much better to replace a printer that have to replace a new computer in 12 months time.
Our advice, bite the bullet, get 64bit Windows 7 Professional.