Moved my comments here, since you had already posted the above and this question got placed 3 different times.
If you bought it in March of 2011 it should still be under warranty. I would suggest contacting Sony tech support for assistance.
If it is literally taking 8hrs to load Windows, I would think it's a hardware issue, or you need to re-install Windows both of which Sony should be able to assist you with.
It's a bit difficult to even begin to troubleshoot a machine that is taking 8hrs to boot on a forum post.