Crash-And Burn, the story of a 15 inch Macbook, that just wont live up to the hype.

Question

I use my computer a lot for some hefty projects on Photoshop and Illustrator. In addition to using it for school. I had a problem last summer with my computer, it started to crash at random. I mean it crashed, like i'd be in the middle of something genius, and the next second, there was nothing. Dead. I took my computer to the mac store, and they sent it to texas or something like that. They gave it back after a week or so and claimed absolutely nothing was wrong with it... I turned it on in the apple store, and click, it crashed again.
Next step was to back all my files to my external, and start fresh. It was finally working well after that. Having no files on my computer, it ran like it was supposed to. After 4 months, I am back with the same problem. It crashes as if it just all of a sudden runs out of batteries. Sometimes it's after 5 hours, sometimes it's every 2 minutes, sometimes it doesn't even start up.
I can't get past the questions, namely, Why me? Why now?
I have my external, but it wont let me add what's on my computer to it, unless i erase everything. I also have my software on here, CS6, and don't want to go through the trouble of legally acquiring it again. I am in Barcelona, and I am traveling again in the next coming weeks to 4 different countries. So I will not be static enough to wait on my computer. I desperately need it to stablize before i begin my next semester of school. It would be very nice for it to stablize before then, as i have many projects i have to do.
Please help me.
please.

Answer 1

this is from Etrecheck
Hardware Information:
          MacBook Pro (15-inch, Early 2011)
          MacBook Pro - model: MacBookPro8,2
          1 2.2 GHz Intel Core i7 CPU: 4 cores
          4 GB RAM
Video Information:
          Intel HD Graphics 3000 - VRAM: 384 MB
          AMD Radeon HD 6750M - VRAM: 1024 MB
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
System Software:
          OS X 10.9 (13A603) - Uptime: 0 days 0:8:17
Disk Information:
          TOSHIBA MK7559GSXF disk0 : (750.16 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 749.3 GB (686 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          MATSHITADVD-R   UJ-8A8 
USB Information:
          Apple Inc. BRCM2070 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Computer, Inc. IR Receiver
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
Problem System Launch Daemons:
          [failed] com.apple.Kerberos.digest-service.plist
          [failed] com.apple.Kerberos.kdc.plist
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.SwitchBoard.plist
          [loaded] com.google.keystone.daemon.plist
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.google.keystone.agent.plist
User Launch Agents:
          [loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.spotify.webhelper.plist
User Login Items:
          iTunesHelper
          Dropbox
3rd Party Preference Panes:
          None
Internet Plug-ins::
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
          Default Browser: Version: 537 - SDK 10.9
          AdobePDFViewerNPAPI: Version: 11.0.04 - SDK 10.6
          AdobePDFViewer: Version: 11.0.04 - SDK 10.6
          o1dbrowserplugin: Version: 4.9.1.16010
          QuickTime Plugin: Version: 7.7.3
          npgtpo3dautoplugin: Version: 0.1.44.29 - SDK 10.5
          googletalkbrowserplugin: Version: 4.9.1.16010
          Silverlight: Version: 5.1.20913.0 - SDK 10.6
          iPhotoPhotocast: Version: 7.0 - SDK 10.8
User Internet Plug-ins::
          Google Earth Web Plug-in: Version: 7.1
Bad Fonts:
          None
Old applications:
          SLLauncher:          Version: 1.0 - SDK 10.5
                    /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
          dynamiclinkmanager:          Version: 6.0.0 - SDK 10.5
                    /Library/Application Support/Adobe/Common/dynamiclink/CS6/dynamiclinkmanager.app
          dynamiclinkmediaserver:          Version: 6.0.0 - SDK 10.5
                    /Library/Application Support/Adobe/Common/dynamiclinkmediaserver/1.0/dynamiclinkmediaserver.app
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               8%          Google Chrome
               5%          WindowServer
               2%          hidd
               1%          EtreCheck
               0%          Battery Health
Top Processes by Memory:
          291 MB          Adobe Illustrator
          143 MB          Google Chrome
          70 MB          Finder
          70 MB          Dropbox
          70 MB          mds_stores
Virtual Memory Statistics:
          917 MB          Free RAM
          1.85 GB          Active RAM
          227 MB          Inactive RAM
          1.02 GB          Wired RAM
          411 MB          Page-ins
          0 B          Page-outs