The four things that make 64-bit Vista inadvisable for ordinary users are:
1: No compatibility with old 16-bit Windows apps. This means ancient Windows 3.x software, which most people don't
run any more, but 16-bit code can still pop up in the darndest places. Like, for instance, in the installer programs
for other apps.
2: No automatic registry and file redirection, which is what 32-bit Vista uses to allow existing software to work
with Vista's better user account security, even if the software wants to do admin-rights stuff to the registry and
Program Files directory. Many apps still break in 32-bit Vista, but many more break in the 64-bit version.
3: No compatibility with existing 32-bit drivers. Everything on your computer will need a new driver. 64-bit WinXP
is the same, and there aren't many 64-bit computers on which Vista won't at least install, but 64-bit Windows
also has...
4: No support for unsigned drivers.
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