> What is safer Windows XP or Windows 7?
You mean more secure? Between the two, Windows 7 (preferably the 64-bit version).
> 32bit application work faster on 32bit system or on 64bit system?
There isn't much difference in 32-bit application perf. b/w 'em.
I use Vista 64, although the OS feels sluggish (Win7 should be better in this respect), the apps run just fine.
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