It all started when i was doing an Avg Pc Tuneup, this blue screen pops up and it was something about physical memory? couldnt read much cause of the shock and it wasnt there for a very long time as the pc rebooted and that was the last time i saw my desktop. Then i searched google and tried running my pc in safe mode? but that didnt work either also, im not sure if i have a system restore point. Another HUGE problem is that im not very computer literate so i need everything spelled out for me i have a "DOS Operating System Install cd and source code" i got it with my dell n5010 would that help fix the problem? Also that after a lot of reboots and efforts to fix this, now all the screen shows when i boot is "reboot and select proper boot device or insert boot media" i dont know what to do now since google isnt much of a help in this case. I have A lot a lot of important files and pictures of family in that pc that i dont want to loose in any case whatsoever so please kindly help me. My important data is on other drives though and not the one thats not working, if thats any help.