Only guest account shows up at start up on Macbook Air

Last night I was updating my Macbook Air, left it alone to do it's update, came back the next morning to turn it on and it was stuck at the apple logo.
After preforming a safe boot, it took me to the login page however only the guest account shows up.
I'm not sure if something went wrong during the update, it was at 70% battery life when i preformed the update so I didn't have it plugged into a power source like recommened, but i've never had a problem with it before.
I've tried enterng control+alt+command+enter which gives me the chance to put in a username and a password.
First I enter my name and passwor, but it was rejected.
So then I tried my apple ID and password, and it was rejected again.
I know I'm entering the right username/password, because it has been the same for my Air, Pro, and iMac.
Now I'm not sure if the account even exsists on my Macbook Air, but the guest account only allowed me to use safari.
I'm not able to access system prefences or anything.
I'm also having trouble with my iMac after updaiting to Mavericks, it work fine until the update and now it's saying my disk is corrupt, but that's a whole other story.
I'm just hoping to fix the problem at home because I really don't want to take two computers down to the Apple store.

If you don't already have a current backup, back up all data, then reinstall the OS. You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used to upgrade.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode.

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i came home to find a guest account in my users folder. i might be getting paranoid about this, but a few days i forgot my mac's wifi unlocked, sharing folders, screen and internet connection. is this because i've turned on back to my mac and find my mac, and if this is so, should there be a guest folder or just an account in the login window? i looked at some logs and i've found this
9/11/12 12:29:12.870 AM digest-service[7103]: label: default
9/11/12 12:29:12.870 AM digest-service[7103]:           dbname: od:/Local/Default
9/11/12 12:29:12.870 AM digest-service[7103]:           mkey_file: /var/db/krb5kdc/m-key
9/11/12 12:29:12.870 AM digest-service[7103]:           acl_file: /var/db/krb5kdc/kadmind.acl
9/11/12 12:29:12.893 AM digest-service[7103]: digest-request: uid=0
9/11/12 12:29:13.054 AM rpcsvchost[7104]: sandbox_init: com.apple.msrpc.netlogon.sb succeeded
9/11/12 12:29:13.081 AM digest-service[7103]: digest-request: init request
9/11/12 12:29:13.119 AM digest-service[7103]: digest-request: init return domain: IMAC server: IMAC
9/11/12 12:29:13.178 AM com.apple.launchd[1]: (com.apple.smbd[7102]) Check-in of Mach service failed. Already active: com.apple.smbd
9/11/12 12:29:13.198 AM digest-service[7103]: digest-request: uid=0
9/11/12 12:29:13.198 AM digest-service[7103]: digest-request: init request
9/11/12 12:29:13.199 AM digest-service[7103]: digest-request: init return domain: IMAC server: IMAC
9/11/12 12:29:13.276 AM digest-service[7103]: digest-request: uid=0
9/11/12 12:29:13.276 AM digest-service[7103]: digest-request: init request
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9/11/12 12:29:33.399 AM rpcsvchost[7107]: dropping duplicate sharepoint Lacie 1
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Path:                  /Applications/Bildbearbeitung/*/Adobe Photoshop CS5.1.app/Contents/MacOS/Adobe Photoshop CS5.1
Identifier:            com.adobe.Photoshop
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Code Type:             X86-64 (Native)
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User ID:               501
Date/Time:             2015-05-03 21:53:39.840 +0200
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Anonymous UUID:        A0DC6EA7-1973-1B68-EFC7-5D60106F084D
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Did tou try resetting the preferences usins the Photoshop keys as your tryind to start Photoshop. Toy cab also use Windows explored or Mac finder deleteor rename you userid Photoshop preferende if you change you OS preferences to be able to see hiddeb files and folders. Do you read the link I posted?
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In this video, learn the two methods of resetting your preference files back to default: Manual preference file removal and Keyboard Shortcut method (starts at 5:05)
by Julieanne Kost
To restore preferences quickly using a keyboard short cut:
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Only guest account shows up at start up on Macbook Air

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