I have had this problem with a couple of PC`s in the past. As above, I remove / strip the lot. Blow clean all parts then reassemble. Ensure your CD / DVD player is clean, I use a cd cleaner disc, & try again. Its surprising how many discs wont read properly on different players.
Incidently, whenever I have problems like this, I always de partition the hard drive back to its raw state, then, re partition it, it seems to work sometimes.
Incidently, whenever I have problems like this, I always de partition the hard drive back to its raw state, then, re partition it, it seems to work sometimes.

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