Board and processor should be all hunky dorey. Check your MOBO revision and Bios as there could be an issue there (although this is unlikely to be causing your problem, you'd be getting a a CPU uCode load error usually). Check you have multiprocessing on. And yes 32 bit is what your going to have to use right now as the others will make a mess of it, plus chances are your audio driver will be flipping the 64 bit system out (unless you have a proper 64 bit driver available).
This sounds to me to be soundcard problems more than anything else.
Make sure that u've installed all the tools and utilities that come on th ASUS board disk and check for any chipset updates. One last thing (before anybody laughs i have seen this happen before) put the machine direct into the wall, so no multisockets and run burn in test see how your performance works out.
Could also be your board and OS not liking 4gb ram in 32 but that wouldnt explain its performance in xp64 unless that was then due to the driver.
Im presuming youve checked things like the temps to make sure that its not getting way too hot in there?
520w supply should be fine in the config so i can see that being a problem really as long as your using a 24pin board connector and not a 20 and if the GFX card powers off the board your using the 8pin connector up by the CPU or the 6 pin connector on the back of the card (wouldnt have thought that a 7300 would require it but could be wrong).
If your powering the interface from USB your not doing this from a PCI based USB hub ? this could be an issue if you have a wireless card or otherwise installed at the same time (not very likely but could well be)
Last resort is reset the CMOS just to make sure there weren't any bizarre configs going on in the BIOS when you first had it, if your running any overclocks id suggest dropping those too.
The final thing that could be causing issues is the onboard soundcard (although thats a very rare problem these days) if so just kill it in the bios and see what happens
The p5q is a great board and i cant undertstand why you'd be getting these issues as a friend has the P5Q-deluxe and an e8400 an it flies along (although hes not really doing much audio work i would have thought that if there was an issue it would have shown up when playing games).
If non of this works then im stumped and the only thing i can suggest is to get a copy of hirens boot CD and run some serious tests on the machine.
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