Hardware/Wireless problem

Right, need somebody to help me with this ultimately random problem.
I have a pc, with stuffz in it. Works fine.

Now to the problem, originally i had 2 Gig's of RAM installed on the motherboard (Asus P5N-E SLI), now just recently i upgraded to 4 Gig (4x 1Gig), same manufacturer, same model of RAM, just newer manufactured but should be exactly the same. And now for some bizar reason my Wireless adapter won't find any networks in range.

It does work with just 2 sticks of ram (new or old no diff, works on all 4 slots aswell).
The mobo does detect all the sticks and says i've got 4 gig installed...
So problem is most likely in the mobo or the wireless adapter (which is a cheap piece of shit).

I reckon either the 4 sticks create somekind of disturbance for the wireless, or they take too much power (is that even possible???), or i dunno help plox!

Ps. Just figured i haven't tried out 2 sticks of 2 diff rams (1 new 1 old) going to try that now see if that makes any diff, cuz maybe they're not cross compatible??

Edit: Crosstested and wireless still worked, so must be mobo, wireless adapter or PSU. Problem is i have none of those layin around to test with. So need some more help!

Edit: Been reading around a bit and apperently it's a more common problem when ppl upgrade to anything over 4 gig on Vista sometimes network cards don't work....
Maybe it's time to upgrade to windows 7 then..