Blue screen on Windows xp Loading Screen

hi everyone i really need your guyz help i been trying to fix this prob for weeks, it all started when i took out my hd and put it back in w/o makin any changes then nothing would load up it kept askin for me to insert bootable media, anyways i did i repair and now i get to the loading screen but i get a blue screen the error is

stop: 0x0000007b (0x0f7c7a630, 0xc0000034, 0x00000000, 0x00000000)

i installed another windows copy on my other hard drive for temp and i am using that right now, all my windows files are there and so are my old files they seem to be ok but its just not booting, can anyone please help, i am so stressed out about this prob, thx so much!

You did not remove or change any jumper pins did you? It may the problem. Becasue removing the HD and putting it back should have no problems whatsoever. I always do this to clean my computer.