NO

[newn]

NO

 

[Geoff]

Nope, if you have a 64 bit processor you can run a 32 bit operating system and 32 bit applications as well.

 

[StrangleHold]

The only time 64 bit will come into play is if your running a 64 bit Operating System, if you have a 64 bit Intel or AMD and run XP 32bit your running 32bit, nothing you can do about it.

 

[StrangleHold]

Yes you can dual boot XP and Vista 64bit on two different drives or two different partitions

64bit
http://zone.ni.com/devzone/cda/tut/p/id/5709

http://www.winsupersite.com/showcase/winvista_ff_x64.asp

 

[Zangetsu]

Just so you know, I have a Dual boot system here. One partition is meant for XP 32bit and one partition for Vista 64 bit, and it runs pretty well.

 

[nyhk]

64-bit Windows also has a subsystem that allows it to run 32-bit applications