My Lenovo Z580 had a hard disk error 6 weeks ago, and I had to send it to Lenovo for them to repair it.
I received my laptop today and sent it to a computer technician to reinstall the Windows 8, since Lenovo wouldn't install it for us. (Note the computer technician is a good friend of mine) He asked me for my previous Windows 8 serial and disc so he can install Windows 8.
When I received it back my laptop states that it only has 3.13 GB of RAM and is a 32-bit. Before I sent it, it was 8 GB of RAM and is a 64-bit.