What version of windows 7 to install? 32 or64

I have a HP Pavilion laptop.  The hard drive crashed while I bought a new one and installed it.  I tried a clean install of windows 7, so I bought the drive for her.  It contained a 32-bit version and a 64-bit version.  I installed the 32-bit and sometimes very well but I need to get some drivers.  When I went to the HP site, it seemed I should have installed the 64 bit version.  How will I know what is the correct version of the machine?

Check the amount of RAM is installed first:

Click Start, right click on computer

Click on properties

Look under "installed memory.

If its less than 4 GB or 3 GB, then Windows 7 32-bit is the appropriate version.

Although 64-bit can run on 2 GB or more, you will not realize the benefits.

64 bit 32 vs

http://Windows.Microsoft.com/en-us/Windows7/32-bit-and-64-bit-Windows-frequently-asked-questions

My PC running the 32-bit version or 64-bit Windows?

http://Windows.Microsoft.com/en-us/Windows7/find-out-32-or-64-bit

http://Windows.Microsoft.com/en-us/Windows7/installing-and-reinstalling-Windows-7

Windows 7 64 bit comes in handy when you need to deal with at least 4 GB of RAM or more. Windows 7 32 bit can use up to 3.2 GB of RAM. Because the address space of memory is much larger for 64-bit Windows, this means that you need two times more memory than the 32-bit Windows to accomplish some of the same task, but you are able to do much more, you can have more apps open, do things like run a virus scan in the background it will affect the performance of your system. 64-bit Windows 7 is safer too, malicious code cannot easily infiltrate it, drivers are more reliable because they must be signed before it can work with 64 bit Windows 7.

Regarding compatibility, you need device drivers 64-bit hardware devices, you may have. In addition, there is no 16-bit subsystem in Windows 7 64-bit, which means, your applications must be 32-bit only, not 16-bit Installer or programs uninstaller. Also, if you decide to switch to Windows 7 64 bit in the future, there is no way to upgrade from 32-bit Windows, clean install only.

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