The boot drive blue screened. No Virus. Reloaded and the install told me the hd was bad. Changed drives

Fist clean your computer of dust using a fine air blower from a compressor specifically around your central processing unit making sure there is no moisture in the air line
as dust will cause a lot of static which will make a computer overheat and cause lots of problems
then test your power supply unit PSU
try replacing all the leads that attach to your hard drive including electrical extensions + IDE,SATA and the ones that attach from your motherboard to hard drive one bad lead will cause a computer to shut down
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
press delete during boot up process enter BIOS then f1 for general help then run chkdsk/f which will automatically fix any corrupt files on your hard drive
hope this helps good luck
you have to keep?a computer very clean & free of dust ?and? give it regular?maintanance
?
good luck with this