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NForce2 all in one version 1.16 driver for WinXP.
That includes the main chipset drivers but it's relatively a LARGE download.
It would be a very good idea to un-install everything that is listed in Add/Remove Progams that looks like it's one of the things that that all-in-one driver installation installs, BEFORE you install that.
Installing main chipset drivers when they are already present or are present but are corrupted usually does no harm at all, but some of the other things that installs might mess things up if they're already present.
Unfortunately, Nvidia does not supply just the main chipset drivers download separately (Intel, Via, and AMD does), even on their own web site
Try the download on the Asus web site first.
Nvidia has a reputation for not fixing problems with their drivers, and these newest drivers may not work properly with your mboard's older chipset.
"BTW, current mobo has the latest flash."
If you haven't already done so, go into the bios and load bios defaults, or, better still, optimized defaults if that's listed, save settings.
Flashing the bios usually does NOT do that automatically!
If the contents of the cmos, part of which are what you see in the bios Setup, are for a previous bios version, then the bios is likely to NOT work correctly!
The bios has two main chunks of data - a read only part, and the cmos part, and a small one, the boot block. When you flash the bios the boot block part is not flashed by default - in most cases it does not change from that for the original bios version for the particular mboard - it's a minimal backup that allows you to try flashing the bios again if something goes wrong while flashing or if you have loaded the wrong bios update (e.g. for another mboard version or revision).
When you load bios defaults you're loading the cmos contents for the particular bios version.
Clearing the cmos by moving a jumper on the mboard then moving it back, or removing the mboard/cmos battery and then re-installing it, also loads bios defaults, but in those cases the time and date are then set to defaults, you get a "Cmos Checksum Error" or similar message the next time you boot, and you have to reset those in the bios Setup after doing those things, save settings.
By the way, contrary to popular belief, flashing the bios is NOT a cure-all!
You ONLY flash the bios if you're having a problem that is mentioned in the notes on the bios updates page for the model, or if you need to flash the bios to support a cpu type your present bios version doesn't support according to the cpu support info for the mboard model.
If you do NEED to update the bios, in most cases, a newer bios version includes all the fixes listed for previous bios versions, but don't load a beta (preliminary; not the final) bios version unless it's listed fixes include your specific problem..
If your system was working fine previously with a particular bios version, if don't need to flash to support a cpu type you intend to install, it makes no sense at all to flash the bios! The bios version could not possibly have anything to do with your problem!
You are taking a big risk when you flash your bios - if the flash fails, and/or the flash chip physically fails while flashing (this is COMMON - these cheap flash chips can only be flashed an unpredictable small number of times), you will have a mboard that will not boot.
E.g. the chips used for a mboard bios are an old type that is not anywhere near as reliable when you flash them (change data on them)as the chips used these days for a USB flash drive, which is hundreds of times if not thousands of times more reliable!
"ps - antec 380W"
"video - Radeon X1650 PRO 256 mb"
The Radeon X1650 PRO AGP chipset requires the system has a minimum 350 watt capacity power supply with an expected +12v amperage capacity to go along with that. Since the Antec 380 watt PSi s a good quality brand, you're probably fine, but if you upgrade the video card you will probably need a PS with more capacity.