MacBook Pro Constantly Freezing (Spinning Wheel every few minutes)

Question

Hardware Information: ℹ️
    MacBook Pro (13-inch, Early 2011) (Technical Specifications)
    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
    Battery Health: Normal - Cycle count 646
Video Information: ℹ️
    Intel HD Graphics 3000 - VRAM: 384 MB
        Color LCD 1280 x 800
System Software: ℹ️
    OS X 10.10.1 (14B25) - Time since boot: 0:36:26
Disk Information: ℹ️
    Hitachi HTS545032B9A302 disk0 : (320.07 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        Macintosh HD (disk1) / : 318.84 GB (171.91 GB free) - 57 errors
            Core Storage: disk0s2 319.21 GB Online
    MATSHITADVD-R   UJ-8A8 
USB Information: ℹ️
    Apple Computer, Inc. IR Receiver
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Startup Items: ℹ️
    iCoreService: Path: /Library/StartupItems/iCoreService
    Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
    [running]    com.trendmicro.itis.loginmgr.agent.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
    [loaded]    com.trendmicro.itis.icore.agent.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [running]    com.zeobit.MacKeeper.Helper.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Wondershare Helper Compact    Application  (/Users/[redacted]/Library/Application Support/Helper/Wondershare Helper Compact.app)
    Google Chrome    Application Hidden (/Applications/Google Chrome.app)
    TmLoginMgr    Application  (/Library/Application Support/TrendMicro/TmccMac/TmLoginMgr.app)
    TmLoginMgr    Application  (/Library/Application Support/TrendMicro/TmccMac/TmLoginMgr.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    Flash Player: Version: 16.0.0.305 - SDK 10.6 Outdated! Update
    Default Browser: Version: 600 - SDK 10.10
    SharePointBrowserPlugin: Version: 14.2.3 - SDK 10.6 [Click for support]
    Silverlight: Version: 5.1.10411.0 - SDK 10.6 [Click for support]
    DirectorShockwave: Version: 12.1.6r156 - SDK 10.6 [Click for support]
    JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
         4%    WindowServer
         3%    Safari
         3%    usernoted
         3%    hidd
         0%    accountsd
Top Processes by Memory: ℹ️
    111 MB    com.apple.WebKit.WebContent
    99 MB    Google Chrome
    85 MB    Safari
    77 MB    WindowServer
    47 MB    softwareupdated
Virtual Memory Information: ℹ️
    590 MB    Free RAM
    1.64 GB    Active RAM
    1.06 GB    Inactive RAM
    1.00 GB    Wired RAM
    1.71 GB    Page-ins
    33 KB    Page-outs
Diagnostics Information: ℹ️
    Mar 16, 2015, 07:51:55 PM    /Library/Logs/DiagnosticReports/coresymbolicationd_2015-03-16-195155_[redacted] .crash
    Mar 16, 2015, 07:21:15 PM    Self test - passed
    Mar 15, 2015, 05:23:24 PM    /Library/Logs/DiagnosticReports/coresymbolicationd_2015-03-15-172324_[redacted] .crash
I ran an EtreCheck on my laptop and this is what the report said. I've had this laptop for about 4 years and it just started freezing up around a week ago. The spinning wheel pops up every few minutes, slows down everything, and makes it extremely frustating to be using the laptop.

Answer 1

When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.  
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.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.