Have 2X2GB Memory sticks, How can I utilize all of it?

[BBhks]

I have a Sony Vaio VGN-AR770, Intel 2.5Ghz, 512mb dedicated video, 2x300GB HDD, blu-ray r/rw. etc... etc... It came w/ 2x1Gb ram sticks. I have recently upgraded it with 2x2gb ddr2 memory sticks. When I go to "System properties", it recognizes all 4GB. However, when i go to "task bar", it only recognizes 3GB. Is there something I can do without having to upgrade to 64bit vista? I can be reached @ BBHksAlico@Yahoo.com if you have a suggestion. THANKS GUYS!!

[Dwarf]

The maximum memory space for a 32-bit version of Windows Vista is 4GB.
However, hardware devices and I/O ports have to be mapped into that memory space, so the maximum memory available for use is usually 3 to 3.5GB dependant on the hardware in the machine. Note that SP1 changed the reporting of the memory so that the full installed amount is reported, but this does not mean that the full amount will be available for use. The only way to access the full 4GB would be to install a 64-bit version of Windows Vista.
Dwarf