windows 7 32 or 64 bit gaming question

[THADEADMAN2011]

i have been doing my backup of all my files as it is time now to redo my system
i want an honest opinion about which to use windows 7 32bit or 64 bit
which is better for gaming? and also i use alot of programs that r only 32 bit
will there be problems? i have 2 pcs i use for gaming
my primary 1 has most all the better stuff
and i can add more ram as i have extra
my motherboards are the same model Asus (M4A77D)
with AMD Athlon II X2 250 3ghz dual core
with 4 gb ddr2 800 ram with Nvidia geforce GTX 550 Ti (1Gb DDR5)
lotsa hard drive space(so no issue there)
so i want to know what will be best to run for a great gaming
experience windows 7 32 bit or 64 bit? i have another 4 gb ddr 2 800 ram all 2 gb sticks if that will make a big difference? thank you in advance for your input
i hope to have all my files backed up by the weekend
so maybe sometime next week i want to redo my system
when i have time off from work
as i am today dumping all files from my 6 500gb drives onto my new 2 Tb drives and will drop my windows drive (250gb) and use a 500gb drive for windows once i have all your input
thanx all