A couple of issues here...
a) Z61m is not able to utilize all 4GB due to a chipset limitation, nothing to do with OS. The BIOS will "see" 4096MB but the machine can only utilize 3GB.
b) Unless you have a Core 2 Duo CPU (not all Z61m units do) in there, 64-bit OS of any kind is a no-go.
c) Lenovo never supported a 64-bit version of XP, so good luck finding drivers. That will be no fun, I can guarantee you...
That being said, Z61m is perfectly happy with standard XP, or even Windows 7 in a 32-bit guise.
Good luck.
Cheers,
George
A31p (2653-???) P4M 2.5/2GB/250GB, 15" UXGA IPS, XPP/Mint ...the best ThinkPad ever...
T43pSFL (2668-BY8) PM 2.2/2GB/32GB SLC SSD, SATA-modded, 15" LED-AFFS UXGA mod, Win 7/Mint...my best friend...
R60F (0657-???) C2D 2.0/3GB/128GB SSD/ 15" SXGA+ IPS, Win 7...a FrankenPad toy for my twin boys...
T410 (2537-RB7) Core i5 2.4/8GB/128GB SSD/14" WXGA+ TFT, Win 7/Mint...just grabbed by my only daughter...
Z61m (9450-38U) C2D 2.0/4GB/500GB/15.4" WSXGA+ TFT, Win 7...my wife's new best friend...
...plus an iPad 2...and a ToughBook...or two...
I build FrankenPads....scary FrankenPads...
S = SATA-mod (on T43/p units only)
F = FrankenPad
L = LED-mod utilizing an UXGA AFFS LED screen
Please DO NOT PM me with requests for individual support, but post your questions and concerns in the appropriate section of the forum where other users can benefit from them as well. Thank you.
