Macbook repair Please help!!!!!!!!

I need help my macbook pro has been super slow. I want to do a repair and learn how to do maintenance periodically. Please help!! I have included copy of the EtreCheck results. thank you.

EtreCheck version: 2.3 (135)

Report generated 7/31/15, 4:57 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: (What does this mean?)

MacBook Pro (15-inch, Early 2011) (Technical Specifications)

MacBook Pro - model: MacBookPro8,2

1 2.2 GHz Intel Core i7 CPU: 4-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 = 282 - SN = D864036R0J7DGDLBM

Video Information: (What does this mean?)

Intel HD Graphics 3000

Color LCD 1440 x 900

AMD Radeon HD 6750M - VRAM: 1024 MB

System Software: (What does this mean?)

OS X 10.10.4 (14E46) - Time since boot: less than an hour

Disk Information: (What does this mean?)

APPLE HDD HTS541075A9E662 disk0 : (750.16 GB) (Rotational)

S.M.A.R.T. Status: Failing

EFI (disk0s1) <not mounted> : 210 MB

Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB

Macintosh HD (disk1) / : 748.93 GB (665.87 GB free)

Core Storage: disk0s2 749.30 GB Online

HL-DT-ST DVDRW GS23NR ()

USB Information: (What does this mean?)

Apple Inc. FaceTime HD Camera (Built-in)

Apple Inc. Apple Internal Keyboard / Trackpad

Apple Inc. BRCM2070 Hub

Apple Inc. Bluetooth USB Host Controller

Apple Computer, Inc. IR Receiver

Thunderbolt Information: (What does this mean?)

Apple Inc. thunderbolt_bus

Gatekeeper: (What does this mean?)

Mac App Store and identified developers

Kernel Extensions: (What does this mean?)

/System/Library/Extensions

[not loaded] com.devguru.driver.SamsungComposite (1.4.31 - SDK 10.6) [Click for support]

/System/Library/Extensions/ssuddrv.kext/Contents/PlugIns

[not loaded] com.devguru.driver.SamsungACMControl (1.4.31 - SDK 10.6) [Click for support]

[not loaded] com.devguru.driver.SamsungACMData (1.4.31 - SDK 10.6) [Click for support]

[not loaded] com.devguru.driver.SamsungMTP (1.4.31 - SDK 10.5) [Click for support]

[not loaded] com.devguru.driver.SamsungSerial (1.4.31 - SDK 10.6) [Click for support]

Launch Agents: (What does this mean?)

[not loaded] com.adobe.AAM.Updater-1.0.plist [Click for support]

[loaded] com.citrix.AuthManager_Mac.plist [Click for support]

[loaded] com.citrix.ReceiverHelper.plist [Click for support]

[running] com.citrix.ServiceRecords.plist [Click for support]

[loaded] com.oracle.java.Java-Updater.plist [Click for support]

Launch Daemons: (What does this mean?)

[running] com.absolute.rpcgeo.plist [Click for support]

[running] com.absolute.rpcnet.plist [Click for support]

[loaded] com.adobe.fpsaud.plist [Click for support]

[loaded] com.adobe.SwitchBoard.plist [Click for support]

[loaded] com.oracle.java.Helper-Tool.plist [Click for support]

[loaded] com.oracle.java.JavaUpdateHelper.plist [Click for support]

[failed] com.perion.searchprotectd.plist [Click for support]

User Launch Agents: (What does this mean?)

[loaded] com.adobe.ARM.[...].plist [Click for support]

[running] com.spotify.webhelper.plist [Click for support]

User Login Items: (What does this mean?)

None

Internet Plug-ins: (What does this mean?)

JavaAppletPlugin: Version: Java 8 Update 51 Check version

Unity Web Player: Version: UnityPlayer version 4.6.1f1 - SDK 10.6 [Click for support]

Default Browser: Version: 600 - SDK 10.10

AdobePDFViewerNPAPI: Version: 10.1.15 [Click for support]

WidevineMediaOptimizer: Version: 6.0.0.12757 - SDK 10.7 [Click for support]

FlashPlayer-10.6: Version: 18.0.0.209 - SDK 10.6 [Click for support]

Flash Player: Version: 18.0.0.209 - SDK 10.6 [Click for support]

QuickTime Plugin: Version: 7.7.3

CitrixICAClientPlugIn: Version: 11.8.2 - SDK 10.7 [Click for support]

SharePointBrowserPlugin: Version: 14.5.3 - SDK 10.6 [Click for support]

AdobePDFViewer: Version: 10.1.15 [Click for support]

DirectorShockwave: Version: 12.1.3r153 - SDK 10.6 [Click for support]

User internet Plug-ins: (What does this mean?)

npBcsMcTcIO: Version: Unknown [Click for support]

Safari Extensions: (What does this mean?)

Trovi Search for Safari

3rd Party Preference Panes: (What does this mean?)

Flash Player [Click for support]

FUSE for OS X (OSXFUSE) [Click for support]

Java [Click for support]

Time Machine: (What does this mean?)

Mobile backups: ON

Auto backup: YES

Volumes being backed up:

Macintosh HD: Disk size: 748.93 GB Disk used: 83.05 GB

Destinations:

LaCie [Local]

Total size: 999.86 GB

Total number of backups: 10

Oldest backup: 2014-07-13 03:55:39 +0000

Last backup: 2015-07-31 19:26:51 +0000

Size of backup disk: Adequate

Backup size 999.86 GB > (Disk used 83.05 GB X 3)

Top Processes by CPU: (What does this mean?)

30% WindowServer

5% Dock

4% nsurlsessiond(2)

4% hidd

2% lsregister

Top Processes by Memory: (What does this mean?)

430 MB kernel_task

262 MB com.apple.WebKit.WebContent

102 MB Safari

98 MB UserEventAgent(2)

74 MB CalendarAgent

Virtual Memory Information: (What does this mean?)

53 MB Free RAM

3.94 GB Used RAM (463 MB Cached)

0 B Swap Used

Diagnostics Information: (What does this mean?)

Jul 31, 2015, 04:33:49 PM Self test - passed

Jul 31, 2015, 04:30:13 PM ~/Library/Logs/DiagnosticReports/PluginProcess_2015-07-31-163013_[redacted].cra sh

Jul 31, 2015, 10:51:29 AM ~/Library/Logs/DiagnosticReports/PluginProcess_2015-07-31-105129_[redacted].cra sh

Jul 30, 2015, 10:29:26 PM ~/Library/Logs/DiagnosticReports/PluginProcess_2015-07-30-222926_[redacted].cra sh

Jul 29, 2015, 05:48:56 PM ~/Library/Logs/DiagnosticReports/PluginProcess_2015-07-29-174856_[redacted].cra sh