my dvd writer was working fine but recently i tried to copy some scratchy old dvds, from then its not working properly . when ever i try to copy/ write a dvd it completely lags my pc and takes like 40 min for just a 4 gb dvd to copy/ write. i even tried using lens cleaner disc but no use. do u guys think i should be to repair it some how or should i buy a new one (which i don't want to )?