my system is hp510n 512 mb ram 40 gb hard drive. i can open ms explorer and nero, mirc fine. but i cannot open my computer or hp pavillion or i.e. my desktop keeps shutting down due to error. i try all three options but they dont restore my active desktop. when i try to open the apps that i mentioned all my desktop icons disappear for one or two miutes and the desktop shutdown screen reappears. registry mechanic is the only program i have recently downloaded. i have tried system restore but it wont restore my computer to an earlier time. thank you.