Hi:
Looking at the hardware that could come in your PC, it should be able to run the 64 bit version of W8.
My recommendation is to download and run the W8 upgrade assistant first.
http://windows.microsoft.com/en-US/windows-8/upgrade-to-windows-8
Turn all you peripherals on (printer, scanner, etc).
Those are more likely not to be supported in windows 8 than your PC is.