How to configure 4Gb Ram to Parallels VM

Hi to everyone!!
i have a mac with Snow Leopard 10.6.8 version with 8 Gb Ram.

i'd like to configure my virtual machine with 4 Gb of ram.

i putted the scroll bar until 4096 Mb and i saved the configuration.

Run the VM (with windows XP Service pk 3) and when i open CCleaner or configuration system into control panel, i saw there are just 2,7 Gb RAM.

why for???

should i to do anything else more then just set the RAM?

Many thanks

 

Sounds pretty typical from what I can tell if you're running 32 bit. See also:
http://forum.parallels.com/showthread.php?t=245950