Disk drive can't read Cds

Hi Fellow Members,
Please help me before I trash my new Acer computer away. These so called computer manufacturers reconditioned their old compters and sell them as new brand computer.

I bought an Acer laptop from Wal-Mart store in Atlanta apparently appeared to be brand new. Unfortunately, the disk drive does not read all CDs I put in. When I checked the drives spaces, 95% of drive © is been used, 80% of drive( D) used, and 100% drive (E ) used. How to clean the disk drive, what can I do to cause my CD drive read Cds.

Thanks,
Uncle Joe