System doesnt allow to install OS
i really need help from some one. I have a Hp pavillion desktop Pentium-4 procesor.
oneday my pc started restarting automatoically everytime i log on. it wasnt showing any error messge but used to restart. then i thought of recovering from Recovery DVD but when installation start it used to stuck in between. then again i tried but again same issue but this time i saw some vertical black line on the blue screen. I tried to install Retail OS rather than using recovery DVD. after few minutes its shows error message on blue screen. I tried to receover pc from backup drive it shows NTLDR missing. I cant even copy ntldr file from Cd coz it shows error message on the blue screen. dont know wht to do please help. I remover the hardware and put them back again same issue, dont know whts going on.