Upgrade the bios from windows 7

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Not sure what you are asking about. Asus site says the motherboard will take DDR2 533/667MHz SDRAM, 2x SO-DIMM socket expandable to 2GB
Which means DDR2 533mhz 1 gig per slot total 2gig
or DDR2 667mhz 1 gig per slot total 2 gig

To enter BIOs press F2 at boot up, but no setting should need to be changed.

They do not have a BIOs update for increasing the memory limits.
BIOs upgrades from first to current are.
BIOS 304
Update new CPU Microcode
System plays wave file and causes garbage sound.
BIOS 305
To fix system cannot do battery pre-charge process when an unknown/failure battery insert.
Support Intel Extend ID CPU:Merom Celeron 530 CPU.
BIOS 306
To fix system cannot do battery pre-charge process when an unknown/failure battery insert.
BIOS 307
Fix System hang at ASUS LOGO on SATA HDD with factory recovery image
Last upgrade date is 2008 7 14

are you win7 pro?
windows 7 home only supports 16gb

If it's Windows 7 32bit it has limits on the amount of ram it can use.
Google it and see.

If you are running a 32 bit version of windows it will only see up to 3.5gig of ram in your system no matter how much ram you put in there.
This is down to 32 bit windows only being able to address a maximum of 3.5 gig of ram.
Windows 64bit can address a far larger amount of ram and is why you will see all windows computers running 4gig or more of ram having Windows 64bit installed.
As you have said your computer is running Windows 7 32bit the only way you will get your computer to see the whole 4gig of ram you have installed is to upgrade to Windows 7 64bit.
Hope this answers your question and helps you out.

Between that processor and the maximum RAM that laptop will take I'm not sure Windows 7 is a really good idea. The consensus seems to be 2 gigs of memory for Windows 7, this will go to 1.2 gigs at max (according to this page).

You could try Windows 7 "starter edition" if you really wanted 7 or there's always that up-and-comer OS Ubuntu, which has a "netbook edition"
(wikipedia has more information if you're interested).

Having said that if you can try it without spending several hundred dollars to see what the performance is like I would say upgrade the memory and try it out to see if the performance is something you can live with. It takes DDR PC2700 SO-DIMM type memory (specs page).

You will need new drivers for Win 7. Before attempting to go to Win 7, run the Microsoft Upgrade Advisor and see what issues it lists: http://go.microsoft.com/fwlink/?LinkId=161223 (since laptops have on-board video that may be an issue). You will be doing a custom install from XP and have to reinstall all of your programs and drivers - many will be available. Several XP programs will not install in Win7 without some work (compatability mode or the XP mode virtual machine (in Pro or Ultimate). Upgrading your software may be needed unless you have the latest version that supports XP through Win7 or want to do the work-arounds.

In addition you would be wise to check for any BIOS updates for your specific machine and apply those. Windows 7 is a good OS if you have 2 GB or more of memory. It can run with less but it isn't better than XP in that case. The biggest difference is that Win7 will be supported by Microsoft for updates for a longer period (patches); XP will lose that support in the next few years.

I hope this helps.
Cindy Wells
(I converted an XP desktop to Win7. However, my video card could handle the OS and I have 2.5 GB of memory and a Windows Experience Index of 3.9 from the system.)

No you don't have to install a 64 bit OS. Only if you install over 3 gigs you MUST install a 64 bit operating system. 800MHZ is fine it will just back down to 667MHZ. your 32bit windows OS will see up to 3 gigs (minus graphics card memory). SO 2 gigs will work fine. Install one stick at a time and check in the OS and bios to make sure each stick works. I would say you possibly have a dead ram stick.

4GB RAM requires a 64 bit compatible processor AND Operating System to be able to access
addresses in memory that exceed the 32 bit assress space.

I'm not familiar with the motherboard that you are using but simply expanding RAM isn't enough if your
system isn't 64 bit compliant. Assuming it is, then ensure that you are using a 64 bit version of Windows 7 opposed to a 32 bit release candidate.

Did you add the two sticks with the 512 or remove the 512 and add the two 1gb sticks? Try booting the machine with ONLY the 1gb sticks in.

Your machine supports 1gb modules but they can't be higher than 533MHz. Check that the memory you purchased was either PC3200 (400MHz) or PC4200 (533MHz) and is 1.8v. If you post the part number off of one of the modules I can look it up for you.