Yosemite broke my mac : (

I installed Yosemite. I'm connected to the internet as I'm using Chrome to type this but Safari and App Store won't connect/work. Other native apps don't work like messaging either. I've restarted my comp multiple times and have run reboot mode twice installing a new OSX 2 times. Still I get "Cannot connect to App store" as one error, for example. My Safari just displays a blank screen. I don't have any time machine logs to revert back to and when I reboot I can only reinstall the latest Yosemite version. I don't see where I can go back to Mavericks, if that would be the solution. Pls help!

Arthur,
You're absolutely right and I think I've learned my lesson.
Here's my Etrecheck:
EtreCheck version: 2.0.11 (98)
Report generated November 27, 2014 at 9:33:11 AM EST
Hardware Information: ℹ️
  MacBook Pro Intel Core i5, Intel Core i7, 13" (Early 2011)
  MacBook Pro - model: MacBookPro8,1
  1 2.3 GHz Intel Core i5 CPU: 2-core
  4 GB RAM Upgradeable
  BANK 0/DIMM0
  2 GB DDR3 1333 MHz ok
  BANK 1/DIMM0
  2 GB DDR3 1333 MHz ok
  Bluetooth: Old - Handoff/Airdrop2 not supported
  Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
  Intel HD Graphics 3000 - VRAM: 384 MB
  Color LCD 1280 x 800
System Software: ℹ️
  OS X 10.10.1 (14B25) - Uptime: 10:57:28
Disk Information: ℹ️
  Hitachi HTS545032B9A302 disk0 : (320.07 GB)
  S.M.A.R.T. Status: Verified
  EFI (disk0s1) <not mounted> : 210 MB
  Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
  Macintosh HD (disk1) /  [Startup]: 318.84 GB (225.08 GB free)
  Core Storage: disk0s2 319.21 GB Online
  MATSHITADVD-R   UJ-8A8 
USB Information: ℹ️
  Apple Computer, Inc. IR Receiver
  Apple Inc. Apple Internal Keyboard / Trackpad
  Apple Inc. BRCM2070 Hub
  Apple Inc. Bluetooth USB Host Controller
  Apple Inc. FaceTime HD Camera (Built-in)
Thunderbolt Information: ℹ️
  Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
  Mac App Store and identified developers
Kernel Extensions: ℹ️
  /System/Library/Extensions
  [not loaded] com.devguru.driver.SamsungComposite (1.4.20 - SDK 10.6) Support
  [not loaded] com.sony.driver.prs2 (1.0.2d1) Support
  [not loaded] com.symantec.kext.ips (1.3.1f6) Support
  /System/Library/Extensions/ssuddrv.kext/Contents/PlugIns
  [not loaded] com.devguru.driver.SamsungACMControl (1.4.20 - SDK 10.6) Support
  [not loaded] com.devguru.driver.SamsungACMData (1.4.20 - SDK 10.6) Support
  [not loaded] com.devguru.driver.SamsungMTP (1.4.20 - SDK 10.5) Support
  [not loaded] com.devguru.driver.SamsungSerial (1.4.20 - SDK 10.6) Support
Launch Agents: ℹ️
  [running] com.barnesandnoble.nookconnect.plist Support
  [loaded] com.divx.dms.agent.plist Support
  [loaded] com.divx.update.agent.plist Support
  [loaded] com.google.keystone.agent.plist Support
  [invalid?] com.sony.ReaderDesktop.RunReaderDesktop.plist Support
Launch Daemons: ℹ️
  [failed] com.adobe.fpsaud.plist Support
  [loaded] com.google.keystone.daemon.plist Support
  [loaded] com.microsoft.office.licensing.helper.plist Support
  [loaded] com.skype.skypeinstaller.plist Support
User Launch Agents: ℹ️
  [invalid?] com.adobe.ARM.[...].plist Support
  [running] com.pia.pia_manager.plist Support
User Login Items: ℹ️
  iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
  readerAppHelper UNKNOWN (missing value)
  KiesAgent ApplicationHidden (/Users/[redacted]/.Trash/Kies.app/Contents/MacOS/KiesAgent.app)
  fuspredownloader ApplicationHidden (/Users/[redacted]/Library/Application Support/.FUS/fuspredownloader.app)
Internet Plug-ins: ℹ️
  o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
  OVSHelper: Version: 1.1 Support
  Default Browser: Version: 600 - SDK 10.10
  Flip4Mac WMV Plugin: Version: 2.4.2.4 Support
  Silverlight: Version: 5.1.30317.0 - SDK 10.6 Support
  FlashPlayer-10.6: Version: 15.0.0.223 - SDK 10.6 Support
  DivX Web Player: Version: 3.2.3.1164 - SDK 10.6 Support
  Flash Player: Version: 15.0.0.223 - SDK 10.6 Cannot contact Adobe
  QuickTime Plugin: Version: 7.7.3
  googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
  SharePointBrowserPlugin: Version: 14.4.5 - SDK 10.6 Support
  JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
3rd Party Preference Panes: ℹ️
  Flash Player  Support
  Flip4Mac WMV  Support
  FUSE for OS X (OSXFUSE)  Support
  Perian  Support
Time Machine: ℹ️
  Time Machine not configured!
Top Processes by CPU: ℹ️
      6% WindowServer
      1% pia_tray
      0% fontd
      0% discoveryd
      0% SystemUIServer
Top Processes by Memory: ℹ️
  129 MB softwareupdated
  94 MB Google Chrome
  73 MB mds_stores
  64 MB Google Chrome Helper
  56 MB WindowServer
Virtual Memory Information: ℹ️
  709 MB Free RAM
  1.61 GB Active RAM
  913 MB Inactive RAM
  1.06 GB Wired RAM
  3.42 GB Page-ins
  156 KB Page-outs
I appreciate your help so far and Happy Thanksgiving to you as well!

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