[lubuntu] Can't install lubuntu

Hi guys, today i tried to install ubuntu but it failed cause of some I/O errors & ext4 filesystem ( i don't remember )
so i decided to install lubuntu (16.05), downloaded the x64 ISO then bued it in a DVD-R with Windows 7's buer.

I had ubuntu before but it had some problems: Skype crashed cause of an 'Input/Output error' and everything stopped working so i rebooted and it kept starting with BusyBox.
Around 1-2 hours later grub won't start, i tried restoring it from the Live CD, yes, it worked but after 2-3 reboots it stopped working again.

The lubuntu installer gets stuck at 'Preparing'.
Searching on the inteet i found that it's a partition problem, so i started GParted but it keeps scaing.

I tried to format with Disks but it gave me an error:

Error creating file system: Command-line `parted --script "/dev/sda" mktable msdos' exited with
 non-zero exit status 1: Error: Input/output error during read on /dev/sdaError: Input/output error during write on /dev/sda(udisks-error-quark, 0)

Oh, sorry for grammatical errors, i'm Italian.

Help appreciated...
thanks :