hi i use xp home edition sp3 and my processor is 64 bit dual core is there a way to convert my os to 64 bit so i can use full 64 bit
You can although it depends on what operating system you plan on upgrading to. For instance, if you have Windows XP (32 bit) currently and want to upgrade to Vista Business (64 bit) you can. Unfortunetly microsoft fails to support this fact. Check out the article below for more info.
Softpedia News
--Locke
Sorry. You will need to buy the 64 bit OS . If you are using Win Xp it is still available to purchase on Newegg.com
I won't recommend people to buy XP 64 now. Go for VIsta 64 (Business or Ultimate). XP 64 is not really a supported mainstream OS. Vista 64 is - and you will get MUCH better device driver support from manufacturers than XP 64.