I have a Compaq cq 50. I recenty purchased new RAM (4gb), new dard disk (500gb) and WIN 8.1 x64 English 1 pk DSP OEI DVD. I have the ram and drive but cannot find good instructions of what to do next (it has been decades since I have built a system). I am a bit hesitant to use the the old drive for anything because of multiple virus problems. ... Do I need to build a boot disc before I use the oem DVD? ... What about a PE? ?.. feeling a little old, out of touch and lost (