Specs for Samsung N120 Netbook

Atom N270 @ 1.60 GHz / 160 GB IDE HDD / 2 GB PC2-5300 DDR2 RAM / Windows XP Home SP3

So I'm still getting some atapi errors in my Event Viewer. Here are two atapi errors I am getting over and over again:

(1) The device, \Device\Ide\IdePort0, did not respond within the timeout period. (2) The driver detected a controller error on \Device\Ide\IdePort0.

In addition, I am repeatedly getting this warning as well:

(1) An error was detected on device \Device\Harddisk0\D during a paging operation.

I just got this back from repair, where before, I couldn't boot at all because I was led to a black screen saying "Operating System Not Found". Still, I got it back and it can boot again, without any hard drive replacement or data loss.

So, how can I get rid of these errors and warnings? What could have happened during repairs to allow my netbook to boot again?

Thanks in advance.