My laptop is running Windows7 64bit, with4gig of memory.It shows there is 4 gig, butmy systemsaysthat only3.25gig is usable Why??

I have a Toshbia Qosmio G30, 4GB of ramwith Windows 764bit saying the exact same thing.BIOS is up to date and stating 4GB of ram.

This is a limitation of the drivers of the 32 bit opsys.Kris

This is a limitation of the drivers of the 32 bit opsys. Kris Did you read the OP?He is using 64bit.

This is a limitation of the drivers of the 32 bit opsys. Kris Did you read the OP? He is using 64bit. oop. my bad. sorry. Kris

What kind of video card does your computer have? If its sharing memory that may be the problem. -Nick

I have the same issue running Windows 7 x64 on 4 GB of memory on a Foxconn motherboard. There have been numerous discussions of this problem in various Internet forums, and not all instances have been solved. If your BIOS has an option for "dynamic memory remap" or something to that effect, make sure that setting is enabled. Otherwise, you'll have to accept for the time being that the memory model has changed slightly in Windows 7 RC, and the operating system is still a work in progress. I'm using the machine with a 512 MB Radeon 4850, which reports 1919 MB of available memory, and it's anyone's guess where it's getting the extra 1407 MB of memory from when my OS seems only to be missing ~768 MB. For further information about how Windows uses memory, you may find this to be an interesting read.-Alex