Right-click My Computer, Properties ... it will say 64-bit after Windows XP, if it is 64-bit.  It will say nothing if it is 32-bit. Another method ... open My Computer, go to C:\ ... if you have only a Program Files folder, then it is 32-bit; if you also have a Program Files (x86) folder, then it is 64-bit. With 32-bit, you are limited to 4GB of RAM - around 3.0-3.4 usable; with 64-bit, you will see around 3.5-3.7GB usable, depending on your specific system configuration. Which model system do you have?
i have trying to determine what windows xp bit version i am running 32 or 64. i have windows xp media professional roll up 2 but has updated too service pack 3. i think i saw an update with a 64 bit patch but i cant find that now.. how could i find out what i have any help would be appreciated.... The reason for wanting to know is ive read 64 bit version will recognize more ddr2 ram. 4gb max on 32 bit and it will recognize 4gb + on 64 bit versions. possibley like windows 7 64 bit. ofcourse it will still read 4gb but it will perform with the extra ram added. so with that being said how can i find which bit version i have...please help thanks.
32 bit xp or is it 64 bit windows xp