Hi, I am having trouble MacBook Air crashing since Yosemite upgrade. I ran an Etresoft check but I don't know what it means... my system runs slowly and crashes. I have to force shutdown. Sometimes screen is black for a split second b/w webmail pages

Hello,
I am having trouble with my MacBook Air 13 inch June 2012 MacBook Air5, 2 4GB RAM  details below in Etresoft report. I recently upgraded to Yosemite and am having system trouble. My computer crashes and I have to force quit to restart. When using webmail there is a black screen for a split second between pages. This did not happen before. I am worried that it is not running properly and perhaps I need to revert to the previous operating system. I only have a MacBook Air and no need to share images between a tablet or phone so I did not need the new photo sharing software of Yosemite. I wonder if I don't have enough RAM to run it? I did not run time machine before I made the upgrade as I did not realise the significance of an upgrade as not very Mac literate. Any advice on whether my system is in danger... most appreciated! I am writing a book and making a back up but this machine is my lifeline and my work is conducted through it. It ran perfectly before... the Yosemite upgrade has perhaps highlighted some problems and it has unnerved me!
Thanks ever so much for your advice!
Lillibet
EtreCheck version: 2.2 (132)
Report generated 5/2/15, 9:53 PM
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Air (13-inch, Mid 2012) (Technical Specifications)
    MacBook Air - model: MacBookAir5,2
    1 1.8 GHz Intel Core i5 CPU: 2-core
    4 GB RAM Not upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en0: 802.11 a/b/g/n
    Battery: Health = Normal - Cycle count = 694 - SN = D86218700K2DKRNAF
Video Information: ℹ️
    Intel HD Graphics 4000
        Color LCD 1440 x 900
System Software: ℹ️
    OS X 10.10.3 (14D136) - Time since boot: 0:22:41
Disk Information: ℹ️
    APPLE SSD SM256E disk0 : (251 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        Macintosh HD (disk1) / : 249.77 GB (167.35 GB free)
            Encrypted AES-XTS Unlocked
            Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
    Apple, Inc. Keyboard Hub
        Mitsumi Electric Apple Optical USB Mouse
        Apple Inc. Apple Keyboard
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Internal Memory Card Reader
    Apple Inc. Apple Internal Keyboard / Trackpad
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Applications/WD +TURBO Installer.app
    [not loaded]    com.wdc.driver.1394HP (1.0.11 - SDK 10.4) [Click for support]
    [not loaded]    com.wdc.driver.1394_64HP (1.0.1 - SDK 10.6) [Click for support]
    [not loaded]    com.wdc.driver.USB-64HP (1.0.3) [Click for support]
    [not loaded]    com.wdc.driver.USBHP (1.0.14) [Click for support]
        /System/Library/Extensions
    [not loaded]    com.wdc.driver.1394.64.10.9 (1.0.1 - SDK 10.9) [Click for support]
    [loaded]    com.wdc.driver.USB.64.10.9 (1.0.1 - SDK 10.9) [Click for support]
Problem System Launch Daemons: ℹ️
    [failed]    com.apple.mtrecorder.plist
Launch Agents: ℹ️
    [running]    com.mcafee.menulet.plist [Click for support]
    [running]    com.mcafee.reporter.plist [Click for support]
    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
Launch Daemons: ℹ️
    [running]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [failed]    com.apple.spirecorder.plist
    [running]    com.mcafee.ssm.Eupdate.plist [Click for support]
    [running]    com.mcafee.ssm.ScanManager.plist [Click for support]
    [running]    com.mcafee.virusscan.fmpd.plist [Click for support]
    [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application  (/Applications/Dropbox.app)
    AdobeResourceSynchronizer    Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
    EvernoteHelper    Application  (/Applications/Evernote.app/Contents/Library/LoginItems/EvernoteHelper.app)
    TouchP-150M    Application  (/Applications/Canon P-150M/TouchP-150M.app)
    iPhoto    Application  (/Applications/iPhoto.app)
    WDDriveUtilityHelper    Application  (/Applications/WD Drive Utilities.app/Contents/WDDriveUtilityHelper.app)
    WDSecurityHelper    Application  (/Applications/WD Security.app/Contents/WDSecurityHelper.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 17.0.0.169 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]
    Flash Player: Version: 17.0.0.169 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    JavaAppletPlugin: Version: Java 8 Update 45 Check version
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
    FUSE for OS X (OSXFUSE)  [Click for support]
    Java  [Click for support]
    MacFUSE  [Click for support]
    NTFS-3G  [Click for support]
Time Machine: ℹ️
    Skip System Files: NO
    Mobile backups: ON
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 249.77 GB Disk used: 82.42 GB
    Destinations:
        My Passport Edge for Mac [Local]
        Total size: 499.94 GB
        Total number of backups: 27
        Oldest backup: 2013-01-31 21:15:26 +0000
        Last backup: 2015-05-02 11:33:09 +0000
        Size of backup disk: Adequate
            Backup size 499.94 GB > (Disk used 82.42 GB X 3)
Top Processes by CPU: ℹ️
         6%    WindowServer
         3%    fontd
         2%    VShieldScanManager
         0%    taskgated
         0%    notifyd
Top Processes by Memory: ℹ️
    745 MB    Google Chrome Helper(8)
    439 MB    kernel_task
    246 MB    VShieldScanner(3)
    160 MB    Google Chrome
    127 MB    Finder
Virtual Memory Information: ℹ️
    130 MB    Free RAM
    3.87 GB    Used RAM
    0 B    Swap Used
Diagnostics Information: ℹ️
    May 2, 2015, 09:30:08 PM    Self test - passed
    May 2, 2015, 08:52:59 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/soffice_2015-05-02-205259_[red acted].crash
    May 2, 2015, 09:28:53 AM    /Library/Logs/DiagnosticReports/backupd_2015-05-02-092853_[redacted].cpu_resour ce.diag [Click for details]
    May 1, 2015, 05:45:24 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/EvernoteHelper_2015-05-01-1745 24_[redacted].crash
    May 1, 2015, 05:38:54 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173854_[redacted].crash
    May 1, 2015, 05:38:43 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173843_[redacted].crash
    May 1, 2015, 05:38:32 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173832_[redacted].crash
    May 1, 2015, 05:38:27 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173827_[redacted].crash
    May 1, 2015, 05:38:10 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173810_[redacted].crash
    May 1, 2015, 05:38:00 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173800_[redacted].crash
    May 1, 2015, 05:37:49 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173749_[redacted].crash
    May 1, 2015, 05:37:38 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173738_[redacted].crash
    May 1, 2015, 05:37:27 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173727_[redacted].crash
    May 1, 2015, 05:37:22 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173722_[redacted].crash
    May 1, 2015, 05:37:06 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173706_[redacted].crash
    May 1, 2015, 05:36:55 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173655_[redacted].crash
    May 1, 2015, 05:36:44 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173644_[redacted].crash
    May 1, 2015, 05:36:33 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173633_[redacted].crash
    May 1, 2015, 05:36:22 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173622_[redacted].crash
    May 1, 2015, 05:36:17 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173617_[redacted].crash
    May 1, 2015, 05:36:01 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173601_[redacted].crash
    May 1, 2015, 05:35:50 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173550_[redacted].crash
    May 1, 2015, 05:35:39 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173539_[redacted].crash
    May 1, 2015, 05:35:28 PM    /Library/Logs/DiagnosticReports/mds_2015-05-01-173528_[redacted].crash
    May 1, 2015, 05:20:29 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/soffice_2015-05-01-172029_[red acted].crash
    May 1, 2015, 04:55:05 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/soffice_2015-05-01-165505_[red acted].crash
    May 1, 2015, 02:53:58 PM    /Library/Logs/DiagnosticReports/sharingd_2015-05-01-145358_[redacted].crash
    Apr 20, 2015, 09:31:20 PM    /Library/Logs/DiagnosticReports/Kernel_2015-04-20-213120_[redacted].panic [Click for details]

When you have kernel panics, the pertinent information is in the panic report.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
In the Console window, select
          DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You'll see a list of reports. A panic report has a name that begins with "Kernel" and ends in ".panic". Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
If you don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
Please don’t post other kinds of diagnostic report.
I know the report is long, maybe several hundred lines. Please post all of it anyway.

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