graphics

You can up the ram on your machine if it can take more.
Go to www.crucial.com and run the test, it'll show you how much you have and how much you can add.
As for the card, I'm sure there are others but I found this...much to expensive.

http://www.magma.com/products/pciexpress/expressbox1/

Thanks but Ive decided to save up and buy a powerfull desktop instead.

Great idea!!!
You'll enjoy it more, post the specs of what your going to get so some of the members that build their own can OK it for you.
Get yourself a nice 24" widescreen monitor.

I was looking at the predetor G7200 by acer.
specs:
AMD Phenom X4 9750 Quad-Core processor
(2.40GHz, 2MB Cache)
Genuine Windows Vista® Home Premium
4GB DDR2 800MHz memory
512MB ATI Radeon HD4850 graphics
640GB SATA hard drive (7200rpm)
Dual Layer DVD Rewriter

I think I might need a 3.00GHz instead of a 2.40GHz.what do you think.

OH and it comes with a 20'' T200 Samsung LCD Monitor.

First, the better the CPU the better the flight Sim will "play", so get the best that you can afford.
Second, if your going to run 2004 not FSX with that machine you will be above to run it full out, to the max.
If you ran FSX you would be well above the default settings, nice nice machine.

20" is very nice, bigger is better especially with the prices today.

Thanks for the advice but I just have one more question.I have both fsx and fs2004 installed on my current computer.It takes up a lot of memory and slows my pc down.Would you install both games or just the one on that new acer desktop?

Both shouldn't slow down the new machine.
Defrag and try disabling your ani virus as long as you don't go on line while flying.
Don't ever disable the firewall!!!!
Enable the anti virus when you are finished flying.

thanks

In your opinion which would improve the overall performance of the computer more?Ram or the graphics card

A friend of mine with Vista 64bit and a AMD 6400 just bumped his ram to 8 gigs, but if you have 32bit it won't read it, only 64bit will.
You have a very nice card but there are new ones out that beat your.
I would get the card and leave the ram alone since it can't be read.

http://support.microsoft.com/kb/929605

but the ram is enough to run fs2004 perfectly even at complex airports such as heathrow from uk2000 isint it

More than sufficient as long as you don't have an overabundance of programs running in the background using up "power".

22" screen has already had its effects on my eyes 😂
Especially playing all the FPS etc, I think a 20" is good

ive found another computer aswell:
specs:
PREMIUM - Intel® Core 2 Quad Processor Q9550 (2.83GHz, 1333MHz, 12MB cache)
Genuine Windows Vista® Home Premium
23in S2309W WIDESCREEN UK Black (1920 x 1080)
1.2 TB (2x 640 GB) Serial ATA (7200 Rpm) Dual HDD Config Raid 0 Stripe
4096MB 1067 MHz Dual Channel DDR3 SDRAM [4x1024]
Graphics 1GB ATI Radeon 3870 X2 graphics card

could you please tell me if this is good enough to run fsx on full settings really smooth and would problems occur if i went with a 64 bit system

That looks very very good.
Full out, probably, with AI at 100%...don't know.

would a better graphics card make the sim smoother or a bigger processor?

CPU will make it run faster but the card can give you better visuals and quite often FPS.

The "game" is CPU orientation, the better the chip the better it runs.