My CD-DVD unit cannot read CD and DVD`s

My Toshiba laptop Satellite 2415-S205 cannot read any DVDs, CDs, etc that were burned or manufacturated. The explorer send a message that said Windows cannot read from this disk.This disk might be corrupted or it colud be using a format that is not compatible with Windows. The led of the CD unit (TEAC DW-224E) reder is permanently on. What can I do to solve this problem?. I use windows xp home edition

I am having the same problem with my Toshiba laptop Satellite 2415-S205.
It will spin up and the lazer will come on but it will not scan the disc.
when I run the troubleshooter routine it says everything is fine.
Tried deleteing the drivers and let them reload, doesn’t help.
Comp USA wanted $300.00 plus to put a new CD drive in.