If you are running XP Home almost certainly it is the 32 bit system. If you
have a 64 bit system you would know it because of the expense involved like
a $5-6000 dollar cost for the Computer. The cards to utilize 64 bit stuff
are inordinately expensive. Take the 32 bit stuff and don't worry about it.
It is recorded somewhere under one of the Control Panel icons. When you have
oppurtunity, click some of them (such as the System icon) and look around
t6o satisfy yourself.
Gene K