Yeah, you don't tell a Mac-addict to buy a PC and you don't tell a system builder to buy a Mac.
Also, this is a hardware problem so it can occur on any computer--even the Mac. I fix several Macs every year in addition to PCs. My friends with Macs that come to me for help never see it coming.
I've been building systems for 12 years now, and believe me when I say if you put a modest investment in to it you will build something that blows anything sold at a store out of the water for a fraction of the price.
I can tell you that this problem is likely hardware related. You possibly have a conflict with the RAM or an I/O device. The first thing you should do is remove one of your sticks of ram and try booting. This will eliminate the 32-bit limitation of your OS as a variable in the problem.
Also, try using each stick individually, this is a symptom of RAM failure, one of your sticks might be bad.
Things like internal memory card readers and network cards could be producing an error with the memory as well. Additionally, any USB devices you have plugged in can trip stop errors and boot up.
I recommend doing this: remove every external device you have connected to the computer (save the keyboard and monitor) and see if the error reoccurs. Next, you should try to remove all internal parts that you possibly can and try booting after you remove each part.
You should be down to just your CPU, motherboard, videocard (to connect to the monitor, if you have a build in videocard, remove the videocard too and try using the onboard for the monitor), one stick of RAM, and your hard drive that you are booting from.
If that doesn't work, you might have to reformat your hard drive. Your install could be busted.
I also recommend trying to boot to Linux with a USB drive. You can find out about that process here: https://help.ubuntu.com/community/In...n/FromUSBStick
I often try to boot to Linux when diagnosing to eliminate hardware issues (64-bit Linux will work with your 8GB of RAM)
Hopefully something on here will help you. good luck!