Posted 01 August 2007 - 06:06 AM
There are 64 bit versions of XP and Vista - but the use of them will be limited by your hardware's driver support. If you don't have 64 bit drivers for all of your hardware, then you won't be able to use a 64 bit OS.
That being said, there's not a whole lot of benefit (IMO) in switching - you'll get the ability to do a bit more, but (especially with a laptop) you won't really have a need for it. I'd suggest that the most effective upgrade you could get for your laptop is another gig of RAM - but the value of this is limited because you just won't notice a great leap in performance with it either.
In the long run, the extra RAM will prevent your system from bogging down if too many processes are eating up your RAM. But there comes a point where all the extra RAM in the world doesn't do a durned thing - and this is because of other limiting factors with the resources of your PC (most commonly the resources that you'll face "limits" on is the RAM, CPU, video, hard drive, and Front Side Bus).
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