Hi
A recovery disk set usually requires 2 or 3 x 4.7 GB DVD+-r,
some can also use 1 x 9.4 GB double layer DVD but that is less reliable.
Are you just getting Smart errors at startup ? (from BIOS)
or you getting disk read errors from Windows ?
If the disk manufacturers diagnostics show your hard disk is failing then you need a new hard disk and a complete backup of any data on the hard disk.
Then fit the new hard drive and re install from the recovery DVD set (or Windows DVD)
(If the recovery images include Microsoft Office and other usefull software and the drivers for chipset, sound, graphics, network & wireless, power management etc it is preferable to a Windows DVD)
regards
Mike Barnes