Wow, you sound like you're in a mess.
1 - If you're not using your machine as a server, you didn't ought to set it up as one; it'll be geared all wrong for you
2 - Can you boot into a live cd? If you can, try mounting your hard drive- are the files still there? Saying that, if you've re-arranged your partitions since then, you'll have formatted the thing.
3 - If you have formatted it, you can get your files back, but its a bit of a ballache; computer forensics aren't something to just pick up. Take a dump of the drive and save it elsewhere, perhaps on your other drive. Maybe look into tools such as foremost, but be aware, the output may make you give up on recovery
4 - BACKUPS
5 - You may want to check your disk isn't dead, y'know: google 'mhdd'; its a good low level tool.