Hi - thanks for the help! I ran the program and this was the result:
EtreCheck version: 2.9.12 (265)
Report generated 2016-05-16 08:43:07
Download EtreCheck from https://etrecheck.com
Runtime 3:57
Performance: Good
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Problem: Beachballing
Hardware Information: ⓘ
iMac (27-inch, Mid 2010)
[Technical Specifications] - [User Guide] - [Warranty & Service]
iMac - model: iMac11,3
1 3.2 GHz Intel Core i3 CPU: 2-core
4 GB RAM Upgradeable - [Instructions]
BANK 0/DIMM0
2 GB DDR3 1333 MHz ok
BANK 1/DIMM0
2 GB DDR3 1333 MHz ok
BANK 0/DIMM1
Empty
BANK 1/DIMM1
Empty
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ⓘ
ATI Radeon HD 5670 - VRAM: 512 MB
iMac 2560 x 1440
System Software: ⓘ
OS X Mavericks 10.9.5 (13F1712) - Time since boot: less than an hour
Disk Information: ⓘ
WDC WD1001FALS-40Y6A0 disk0 : (1 TB) (Rotational)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 999.35 GB (825.04 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
HL-DT-STDVDRW GA32N ()
USB Information: ⓘ
Apple, Inc. Keyboard Hub
Apple, Inc Apple Keyboard
Apple Internal Memory Card Reader
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Apple Inc. Built-in iSight
Gatekeeper: ⓘ
Mac App Store and identified developers
Kernel Extensions: ⓘ
/Library/Application Support/VirtualBox
[loaded] org.virtualbox.kext.VBoxDrv (4.3.30 - 2015-08-21) [Support]
[loaded] org.virtualbox.kext.VBoxNetAdp (4.3.30 - 2015-08-21) [Support]
[loaded] org.virtualbox.kext.VBoxNetFlt (4.3.30 - 2015-08-21) [Support]
[loaded] org.virtualbox.kext.VBoxUSB (4.3.30 - 2015-08-21) [Support]
System Launch Agents: ⓘ
[not loaded] 5 Apple tasks
[loaded] 148 Apple tasks
[running] 31 Apple tasks
System Launch Daemons: ⓘ
[not loaded] 48 Apple tasks
[loaded] 135 Apple tasks
[running] 65 Apple tasks
Launch Agents: ⓘ
[not loaded] com.adobe.AAM.Updater-1.0.plist (2014-09-29) [Support]
[loaded] com.mcafee.menulet.plist (2009-09-17) [Support]
[loaded] com.mcafee.reporter.plist (2009-09-17) [Support]
[loaded] com.oracle.java.Java-Updater.plist (2014-04-15) [Support]
[running] jp.co.canon.CUPSCMFP.BG.plist (2012-11-21) [Support]
[running] jp.co.canon.CUPSPS2.BG.plist (2010-04-22) [Support]
[running] jp.co.canon.UFR2.BG.plist (2012-11-21) [Support]
Launch Daemons: ⓘ
[loaded] com.adobe.fpsaud.plist (2016-05-09) [Support]
[loaded] com.macpaw.CleanMyMac2.Agent.plist (2014-11-13) [Support]
[loaded] com.mcafee.ssm.Eupdate.plist (2009-09-17) [Support]
[loaded] com.mcafee.ssm.ScanManager.plist (2009-09-17) [Support]
[running] com.mcafee.virusscan.fmpd.plist (2009-09-16) [Support]
[loaded] com.microsoft.office.licensing.helper.plist (2010-08-25) [Support]
[loaded] com.oracle.java.Helper-Tool.plist (2014-04-15) [Support]
[not loaded] org.virtualbox.startup.plist (2015-08-21) [Support]
User Launch Agents: ⓘ
[loaded] com.adobe.ARM.[...].plist (2010-12-02) [Support]
[loaded] com.adobe.ARM.[...].plist (2011-02-10) [Support]
[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist (2015-12-14) [Support]
[loaded] com.google.keystone.agent.plist (2016-03-02) [Support]
[loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist (2014-11-13) [Support]
[loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist (2014-11-13) [Support]
[loaded] com.macpaw.CleanMyMac2Helper.trashWatcher.plist (2014-11-13) [Support]
[not loaded] org.virtualbox.vboxwebsrv.plist (2015-08-21) [Support]
User Login Items: ⓘ
Microsoft Database Daemon Application (/Applications/Microsoft Office 2008/Office/Microsoft Database Daemon.app)
rgc2$ Volume Hidden (/Volumes/rgc2$)
rgc$ Volume Hidden (/Volumes/rgc$)
AdobeResourceSynchronizer Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
Microsoft Database Daemon Application (/Applications/Microsoft Office 2011/Office/Microsoft Database Daemon.app)
EvernoteHelper Application (/Applications/Evernote.app/Contents/Resources/EvernoteHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Box Sync Application (/Applications/Box Sync.app)
Other Apps: ⓘ
[running] [0x0-0x36036].com.etresoft.EtreCheck
[running] com.box.sync.63744
[running] com.evernote.EvernoteHelper.35232
[running] com.getdropbox.dropbox.14464
[running] com.microsoft.entourage.database_daemon.29952
[running] com.microsoft.outlook.databasedaemon.32416
[running] jp.co.canon.cijscannerregister.12704
[running] org.mozilla.firefox.12528
[loaded] 448 Apple tasks
[running] 259 Apple tasks
Internet Plug-ins: ⓘ
Default Browser: 537 - SDK 10.9 (2014-09-26)
Flip4Mac WMV Plugin: 2.4.4.2 (2012-10-12) [Support]
OfficeLiveBrowserPlugin: 12.3.6 (2013-03-13) [Support]
AdobeAAMDetect: AdobeAAMDetect 1.0.0.0 - SDK 10.6 (2014-09-29) [Support]
FlashPlayer-10.6: 21.0.0.242 - SDK 10.6 (2016-05-13) [Support]
AdobePDFViewerNPAPI: 11.0.16 - SDK 10.6 (2016-05-16) [Support]
Silverlight: 5.1.41212.0 - SDK 10.6 (2016-01-19) [Support]
QuickTime Plugin: 7.7.3 (2016-03-28)
Flash Player: 21.0.0.242 - SDK 10.6 (2016-05-13) [Support]
iPhotoPhotocast: 7.0 (2010-08-10)
SharePointBrowserPlugin: 14.4.4 - SDK 10.6 (2014-09-12) [Support]
AdobePDFViewer: 11.0.16 - SDK 10.6 (2016-05-16) [Support]
CANONiMAGEGATEWAYDL: 3.2.0.1 - SDK 10.6 (2012-04-26) [Support]
JavaAppletPlugin: Java 8 Update 91 build 14 (2016-05-10) Check version
User internet Plug-ins: ⓘ
CitrixOnlineWebDeploymentPlugin: 1.0.105 (2013-04-25) [Support]
WebEx64: 1.0 - SDK 10.6 (2014-07-15) [Support]
3rd Party Preference Panes: ⓘ
Flash Player (2016-05-09) [Support]
Flip4Mac WMV (2012-05-15) [Support]
Java (2016-05-10) [Support]
TeXDistPrefPane (2015-09-16) [Support]
Time Machine: ⓘ
Time Machine not configured!
Top Processes by CPU: ⓘ
7% mdworker(4)
3% fontd
2% WindowServer
1% kextcache(3)
1% Canon CMFP BackGrounder
Top Processes by Memory: ⓘ
676 MB firefox
433 MB kernel_task
201 MB kextcache(3)
168 MB com.apple.IconServicesAgent(2)
139 MB Dropbox
Virtual Memory Information: ⓘ
435 MB Free RAM
3.57 GB Used RAM (1.46 GB Cached)
0 B Swap Used
Diagnostics Information: ⓘ
May 16, 2016, 08:29:16 AM /Library/Logs/DiagnosticReports/mds_stores_2016-05-16-082916_[redacted].crash
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadat a.framework/Versions/A/Support/mds_stores
May 16, 2016, 08:26:56 AM Self test - passed
May 13, 2016, 04:46:15 PM /Library/Logs/DiagnosticReports/Mue_InUse_2016-05-13-164615_[redacted].crash
/Library/McAfee/*/Mue_InUse