Actually the amount recognized may be as low as 2.75 GB, not 3.2, Peacelover. With my desktop when I was still running 32 bit XP and I installed 4 GB RAM to test prior to switching to Vista 64-bit, my 32-bit install only saw 2.75 GB.
Antec Nine Hundred, C2Q Q9300 (Currently at stock speeds), Asus Maximus II Formula, OCZ Reaper HPC DDR2 1066 4GB (2x2GB), BFG 9800GTX+, SupremeFX X-Fi, OCZ GameXStream 700W, Seagate 500 GB SATA hard drive, Seagate 750 GB SATA hard drive, Samsung SH-S203N SATA DVDRW, Lite-On LH-20A1L SATA DVDRW, Zalman 9700 LED, Windows Vista Ultimate 64-bit retail version with SP1