Yes, you can.
But that depends on what type of hard drive you have on your laptop, IDE / SATA.
You can get an IDE/SATA converter at an electronics store or search for one on the net.
Check this for an IDE drive.http://articles.techrepublic.com.com/5100-10878_11-5160538.html
For SATA drive, its fairly simple as the laptop hard disk and desktop connections are the same, as well as power pins.