My MacBook Pro 13" early 2011 is slow and often freezing. Hope someone can help...

My Macbook Pro 13" early 2011 is running very slow, often freezes, restarting results in a horizontal bar appearing under the Apple logo every time. Yosemite has just been re-installed. Disk doctor found nothing. Let me attach the Etrecheck report:

EtreCheck version: 2.1.6 (109)

Report generated 17 Jan 2015 12:25:56 CET

Download EtreCheck from http://etresoft.com/etrecheck

Click the [Support] links for help with non-Apple products.

Click the [Details] links for more information about that line.

Click the [Adware] links for help removing adware.

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

8 GB RAM Upgradeable

BANK 0/DIMM0

4 GB DDR3 1333 MHz ok

BANK 1/DIMM0

4 GB DDR3 1333 MHz ok

Bluetooth: Old - Handoff/Airdrop2 not supported

Wireless: en1: 802.11 a/b/g/n

Battery Health: Normal - Cycle count 422

Video Information: ℹ️

Intel HD Graphics 3000 - VRAM: 512 MB

Color LCD 1280 x 800

System Software: ℹ️

OS X 10.10.1 (14B25) - Time since boot: 0:11:44

Disk Information: ℹ️

SAMSUNG HM500JJ disk0 : (500,11 GB)

EFI (disk0s1) <not mounted> : 210 MB

Macintosh HD (disk0s2) / : 499.25 GB (49.05 GB free) - 3 errors

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

MATSHITADVD-R UJ-898

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.apogee.driver.ApogeeUSBGIOAudio (1.0.0a1) [Support]

Problem System Launch Daemons: ℹ️

[failed] com.apple.smbd.plist [Details]

Launch Agents: ℹ️

[loaded] com.oracle.java.Java-Updater.plist [Support]

Launch Daemons: ℹ️

[loaded] com.adobe.fpsaud.plist [Support]

[loaded] com.microsoft.office.licensing.helper.plist [Support]

[loaded] com.oracle.java.Helper-Tool.plist [Support]

[loaded] com.oracle.java.JavaUpdateHelper.plist [Support]

[loaded] com.sonos.smbbump.plist [Support]

User Launch Agents: ℹ️

[invalid?] com.google.GoogleContactSyncAgent.plist [Support]

[loaded] com.google.keystone.agent.plist [Support]

[running] com.spotify.webhelper.plist [Support]

User Login Items: ℹ️

iTunesHelper UNKNOWN Hidden (missing value)

ApogeeRegistration UNKNOWN (missing value)

Music Manager UNKNOWN Hidden (missing value)

Music Manager UNKNOWN Hidden (missing value)

GiOPopUp Application (/System/Library/Extensions/GIOPlugIn.bundle/Contents/GiOPopUp.app)

Internet Plug-ins: ℹ️

JavaAppletPlugin: Version: Java 7 Update 71 Check version

FlashPlayer-10.6: Version: 16.0.0.257 - SDK 10.6 [Support]

QuickTime Plugin: Version: 7.7.3

Flash Player: Version: 16.0.0.257 - SDK 10.6 [Support]

Default Browser: Version: 600 - SDK 10.10

SharePointBrowserPlugin: Version: 14.3.1 - SDK 10.6 [Support]

Google Earth Web Plug-in: Version: 6.0 [Support]

Silverlight: Version: 5.1.10411.0 - SDK 10.6 [Support]

iPhotoPhotocast: Version: 7.0 - SDK 10.8

User internet Plug-ins: ℹ️

Unity Web Player: Version: UnityPlayer version 2.6.1f3 [Support]

Safari Extensions: ℹ️

AdBlock [Installed]

3rd Party Preference Panes: ℹ️

Flash Player [Support]

Java [Support]

Perian [Support]

Time Machine: ℹ️

Time Machine not configured!

Top Processes by CPU: ℹ️

26% mds_stores

23% mds

6% WindowServer

2% launchd

0% fontd

Top Processes by Memory: ℹ️

509 MB mds_stores

309 MB com.apple.WebKit.WebContent

223 MB Safari

129 MB ocspd

60 MB WindowServer

Virtual Memory Information: ℹ️

3.72 GB Free RAM

2.42 GB Active RAM

1.00 GB Inactive RAM

1.45 GB Wired RAM

2.81 GB Page-ins

0 B Page-outs

Diagnostics Information: ℹ️

Jan 17, 2015, 12:14:48 PM Self test - passed

Thanks for your help!

Benedek