The biggest reason is that Microsoft did not require OEMs to produce drivers for both 32bit and 64bit versions of Windows XP in order to slap the "Designed for Windows XP" logo on the box. This is especially common with Antivirus software. This leads up to issue number two, a lot of licensed software sees Windows XP 64bit as Windows Server 2003 and refuses to install because their licensing conditions don't cover server operating systems.
This means Windows XP 64bit doesn't even use the same kernel version as Windows XP 32bit, which can cause driver programmers some serious headaches. Instead of doing major revisions to the Windows XP codebase, Microsoft build Windows XP 64bit on top of Windows Server 2003 since it already had a working 64bit variant. The first issue is that Windows XP 64bit isn't Windows XP at all, it's Windows Server 2003. You can't really blame them, Windows XP 64bit has always been an under-supported OS, and there are a number of reason why. Apparently NetGear thinks noone uses Windows XP 64-bits and none of their products seem to have 圆4 drivers for XP.
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