Before you decide to upgrade to Windows 64 you should consider several things. You should consider if your computer meets the recommended requirements. You would have to make sure that you are willing to encounter some difficulties that may arise when you reach a compatibility issue. You must also be prepared to buy new hardware in the case that some of your old hardware no longer performs the way that you want it to.
Windows Vista 64 has a lot of requirements that you need to meet before you actually install it. It is much better to meet the recommended requirements instead of the minimum requirements. If you do not meet the recommended requirements then you would do much better to stick with Windows XP or Windows Vista 32 as your operating system. If you install Windows Vista 64 with minimum requirements than you will see that your computer will get stuck just running normal programs. You may receive a little boost when you are using 64 bit programs but 32 bit programs will cause you to dread your computer.
Since you are using Windows Vista 64 you will eventually run into the problem of having some software that is not compatible. One of the main problems that you will run into is when you install programs that use drivers that have not been digitally signed. This is a major problem because Windows Vista 64 will not allow you to use the program if the drivers are not digitally signed. Sometime this can affect even some of the most legitimate programs and drivers. You would have to go through a series of frustrating steps to figure out how to install drivers on Windows Vista 64 without them being digitally signed.
Another problem is that there are a lot of pieces of hardware that will give you some problems when you are trying to install them on Windows Vista 64. Sometimes that installation disc will not allow you to install the software required for the hardware because it does not recognize Windows Vista 64 as an acceptable operating system. Other times, hardware that you plug into a computer that has Windows Vista 64 as it operating system will fail to be recognized by the computer at all. That means when you plug up the hardware you will not get any type of message that notifies you that you have properly attached the hardware to the computer. These are just some of the problems you can run into when you installed or upgrade to Windows Vista 64. There is no need to be scared however since most installations of Windows Vista 64 work pretty well.