Note about AMD64 and IA64 drivers vs. IA32
If you have a Pentium [MMX,II,III,IV] or Athlon, you need to use the IA32 drivers (1.0-4191). If you're unsure of what CPU you have, then you should use the IA32 drivers.
The AMD64 drivers (1.0-4180) are intended for machines running AMD's x86-64 chips (codename Hammer), and not Athlons.
The IA64 drivers (1.0-4050) are only intended to be used on machines running Itanium or Itanium II processors.
I hope this helps alleviate some of the confusion... if you're still not sure, please reply and ask!