Help me fix my computer up to play WoW

Ok so i'm not looking for anything special. I'm just hoping to spend a minimal amount of money to make my computer run WoW competently. Current specs are:

ok here goes....

Celeron D 3.33 Ghz
512 MB ram (DDR2, but I'm not sure what speed)
onboard ati 1100 express

aaaand the big winner windows vista OS.

So I realize I'm running w/ a very minimal amount of ram and an onboard. I have available to me a Quadro FX 370. While I understand this is not for gaming, do you think it will improve my performance? Even if just a little bit?

What's the cheapest fixes I can do to make the game playable, that's all I'm really looking for? Is it basically mandatory that I buy at least another 512 stick of ram?

Any advice is greatly appreciated.

Serious upgrade to the RAM (very cheap)... then maybe a cheap graphics card...

^ Come on! 4GB is only $66 or so

http://www.newegg.com/Product/Prod [...] 6820145184

not to mention

http://www.newegg.com/Product/Prod [...] 6814125086

I checked out your motherboard on google and there isn't much for me to look at. I did find something just as "Alhena5" and it had a PCI-Ex16 slot, so you could essentially find a cheapo graphics card and see if it works with your build. I would recommend getting the graphics card over the memory because out of the two, it gives you a much better difference.

Is your PC an HP Pavilion a1410y CTO Desktop PC
If yes then your mobo could be this one
http://h10025.www1.hp.com/ewfrf/wc [...] 035&dlc=en

It supports the following processors
Pentium D 9xx Dual Core
Pentium D 8xx series Dual Core
Pentium 4 6x1 series
Pentium 4 6xx
Pentium 4 5xx
Celeron D

And Max. Ram
2GB DDR2 400/533 (240Pins)

With Vista you need at least 2GB Ram
It has one PCIX16
so you can upgrade your graphic card

Crack the case and see if you're running a single 512 stick or 2:256. Many OEMs will pop in 2 sticks due to inventory management ease and costs. You'll also want to see what your PSU is rated at, does it have the necessary 6pin to run a decent vid card should you want to upgrade the card down the road? Is the PSU even a standard ATX design?

You can buy a 1g ddr2 667 quite cheap, most systems built in the past 3-4yrs will recognize a 1gb chip.
$30 http://www.newegg.com/Product/Prod [...] 6820145505

Don't forget you may have to go into the bios and disable the onboard video after installing the graphics card. That will also give you a slight boost right away with Vista as you're eliminating the drain on your RAM via the shared graphics.

edit: I'm assuming the case is a standard mid-mini tower and not a low profile design?