no. the BSOD started the first day i used the PC. did add Norton very soon but BSOD's were already a problem. i remember thinking Norton 360 might solve the issue with it's "pc optimization" stuff. i noticed no increase or decrease in crashes after Norton install. same would apply to the hard drive add and graphics card add.
although it may sound stupid coming from someone who knows near nothing about computers....i can't see norton or my hard adds being the problem here. it just doesn't make sense since the issue's were present before the changes were made. especially the advise to remove the hardware (which was installed much later and after *many* BSOD occurrences).
i know you guys are really good at what you do and mean no disrespect. it seems i don't have enough info for you to nail this down. don't know what else to do at this point.