Diamond won't get past boot screen, can I somehow reset it without losing data?

[mailboxcow]

Basically I was going to take a picture with the phone, and suddenly it restarted itself. Now it won't get past the boot screen and keeps loading over and over and over, annoyingly vibrating each time. I saw a couple of threads about the 4 button combination you can do.

I'm basically a noob when it comes to this, and I've never flashed ROMs or anything like that, so I'm not too familiar with the terminology or what will happen. I'd like to fix this without losing my pictures, contacts, etc, is that possible to do?

Thanks so much!