The only thing that might be an issue are the 64 bit drivers for older hardware.
Ah my thoughts as well! -I have just installed Windows 7 32bit after wiping the disc (again). My logic being that as I will not add more memory to the PC it will have to make do with the maximum 4Gb (installed) for 32bit
This is one of the rare occassions when I had the foresight to get a retail version of Windows so I can pick and chose 32bit or 64bit as well as allowing a future upgrade to the motherboard/CPU.
As this install is to stay I have loaded the motherboards Windows 7 32 bit drivers for the chipset/network/sound devices but will stay with an older graphics card driver as I feel newer releases seem to be more for newer cards benefit than any improvement on the older ones. Hopefully the 32bit drivers for Windows 7 will be more stable if it turns out that was the problem.