Thanks everyone for your suggestions.They're much appreciated.
Well,i've just gone through most of your recommendations but unfortunately to no avail.First,i decided to reformat and then reinstall Windows but on 'Copying files needed for Windows Setup...'part,next came 'F:\>'and still nothing happens.
I think the HDD is not the culprit,cause i managed to installed it as slave in a working system that i have.I managed to access D: drive to save and write the data to a CD-RW.But,of course i did this before i deleted C: earlier.
I also tried a working HDD cable,but no luck.Next i exchanged power connector with the CDROM,and got negatve result too.
And finally i hooked up my working system's HDD plus its cable and plugged it into the problem PC,as a standalone master HDD(I did set up BIOS for this configuration).Even with this set up i got errors and couldn't access my OS.
So i think (?)it could be MOBO problems or could it be the HDD controller gone weary?How do i fix this without buying a secondhand MOBO? I read somewhere that i could buy a PCI card based HDD controller/adapter,just like a RAID card? Is this the best solution?