Use the built-in windows update feature accessed from
Start --> Help and Support, etc. This will find all
patches relavent to your computer. It determines which
operating system you have. It also checks your hardware
and occassional offers driver updates or other hardware-
specific patches.
As to your original question: If you have a Pentium
processor, it is definitely 32 bits. 64-bit processors
(e.f., Intel Itanium) and motherboards are rather
expensive and found only on high-end servers.
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