Been using XP64 since its launch which is over 3 years ago.
I had issues at *** very beginning with drivers, but since then I have used what normal people call "Common sense" and these days if people have driver issues with XP64 then thats probably because they were in "that special class" in school.
I hate the way people **** off XP64 when they are clearly so wrong.
XP64 is faster than the other 3 too in most cases.
I have been running Vista64 for the last few weeks, and just a couple of days ago went back to XP64, this is now the 7th time I have done that and quite simply, while I want so much to go to Vista64 ( After all I bought it and am not using it ), it does not work for me anywhere near as well as XP64 does.
I cannot hack the slow copying/Moving, the unresponsiveness when running half a dozen apps, the overall performance of XP64 vs Vista64 just cannot be compared and XP64 is simply leagues ahead... Sure, the ga pis closing and every time I try Vista64 out, its getting better and better, but its still way off me wanting to leave XP64.
Trust me on this MH79 but XP64 is vastly superior to XP32 and you are going to soon start to see that... A lot of games also have 64Bit updates to them, one such game being FarCry, looks much better in XP64Bit, also Source Games too like HL2 etc also have optimized 64Bit code.
Ok, programs that I have had issues with when moving from 32 to 64
O&ODeFrag
Even though I have bought v10, I use v8.6 and I need a 64Bit version of this.
Vista64 FWIW takes longer to analyse its C: than XP64 takes to fully defrag it!!!
PAGEDEFRAG
I loved this under 2K and XP32 but can no longer use it...
Partition Magic
Not for 64Bit bu tthen its not for Vista either and so I went with acronis and to be honest, its much better than PM anyway, so no problems there.
Modem Drivers
I now use a router
Scanner
I used Common sense and my next scanner I bought I didnt get a cheap and nasty one and XP has drivers built in for it
Same with my WebCam - although I have never used it as a webcam, but I have drivers for that too.
Printers... When I moved to XP64 I had an Epson C42... Drivers were unavailable for that ( I think they are now though, but who cares? ) and all printers in the last 2 or 3 years have 64Bit drivers, and if the printer does not, then its obviously not a good printer.
Similarly for pretty much anything really.
End of the day, XP64 has been out over 3 years now and all the good stuff is fully supported by all the good companies and so if you actually have anything that does not have XP64 Drivers available then... Wow, you really should update your kit.
As for Vista64 v XP64 when it coems to drivers, this I have found is total B/S because XP64 has more drivers than Vista64, but of course the vista users dont like that so they try putting XP64 down.
XP64 is the best, fastest, most compatible and most reliable O/S of all the windows versions so far, not worth argueing that one, so just use it and enjoy.