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I’ve seen 64bit on a PCs specifications so what does it mean?
A 64bit PC has a operating system (e.g. Windows Vista/7) that can take advantages of 64bit instructions and use over 3.3Gb of RAM which is the maximum limit set by computers with only 32bit operating systems.

Well that’s all so well and good but what do I get out of it?
On certain programs you will see a dramatic (up to double) increase in performance additionally many 64bit applications are more stable when compared to the 32bit versions thus allowing for a smoother running PC.

What do you mean by ‘certain’ programs?
Without 64bit hardware (e.g. any modern processor and over 4Gb of RAM) and a 64bit operating system you will not be able to take advantage of 64bit. Also as this is still relatively new technology very few consumer programs are being written in 64bit.

If everything is still being written in 32bit what’s the point?
Computers that come with 64bit are future proof, its like when DVD Players first came out if you didn’t buy one then you would still need to buy one in the future as eventually 32bit will no longer be used just as the VHS tape is no longer used.

If its new technology surely it costs more?
That’s simply not true, in fact the latest version of Microsoft Windows (Windows 7) is only available to buy with both the 32bit and 64bit install DVDs.

What are the disadvantages?
Although a 64bit operating system can use 32bit programs they cannot run anything that uses 16bit instructions. Also you may experience problems with certain items of hardware that do not come with 64bit drivers, however anything bought after 2006 should work fine but its always best to check.

What to know more?
Check out these links-
64bit on Wikipedia – Gives detailed information
Microsoft on 32bit vs 64bit – Microsoft’s FAQ