I just ran Etresoft and these are the results...Help?

Question

Problem description:
iMac running sluggishly.
EtreCheck version: 2.1.2 (105)
Report generated December 11, 2014 at 4:02:28 PM EST
Hardware Information: ℹ️
  iMac (21.5-inch, Late 2009) (Verified)
  iMac - model: iMac10,1
  1 3.06 GHz Intel Core 2 Duo CPU: 2-core
  4 GB RAM Upgradeable
  BANK 0/DIMM0
  empty empty empty empty
  BANK 1/DIMM0
  empty empty empty empty
  BANK 0/DIMM1
  2 GB DDR3 1067 MHz ok
  BANK 1/DIMM1
  2 GB DDR3 1067 MHz ok
  Bluetooth: Old - Handoff/Airdrop2 not supported
  Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
  ATI Radeon HD 4670 - VRAM: 256 MB
  iMac 1920 x 1080
System Software: ℹ️
  OS X 10.10.1 (14B25) - Uptime: 4 days 11:25:45
Disk Information: ℹ️
  ST31000528AS disk0 : (1 TB)
  S.M.A.R.T. Status: Verified
  EFI (disk0s1) <not mounted> : 210 MB
  Macintosh HD (disk0s2) /  [Startup]: 999.35 GB (13.97 GB free) (Low!)
  Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
  HL-DT-ST DVDRW  GA11N 
USB Information: ℹ️
  Apple Inc. Built-in iSight
  Apple, Inc. Keyboard Hub
  Apple, Inc Apple Keyboard
  Apple Internal Memory Card Reader
  Apple Computer, Inc. IR Receiver
  Apple Inc. BRCM2046 Hub
  Apple Inc. Bluetooth USB Host Controller
Gatekeeper: ℹ️
  Mac App Store and identified developers
Startup Items: ℹ️
  HP IO: Path: /Library/StartupItems/HP IO
  Startup items are obsolete in OS X Yosemite
Problem System Launch Agents: ℹ️
  [failed] com.apple.AirPlayUIAgent.plist [Details]
  [failed] com.apple.CallHistoryPluginHelper.plist
  [failed] com.apple.CallHistorySyncHelper.plist
  [failed] com.apple.cmfsyncagent.plist [Details]
  [failed] com.apple.coreservices.appleid.authentication.plist
  [failed] com.apple.EscrowSecurityAlert.plist
  [failed] com.apple.printtool.agent.plist
  [failed] com.apple.rcd.plist [Details]
  [failed] com.apple.recentsd.plist [Details]
  [failed] com.apple.sbd.plist
  [failed] com.apple.security.cloudkeychainproxy.plist
  [failed] com.apple.spindump_agent.plist [Details]
  [failed] com.apple.telephonyutilities.callservicesd.plist
Problem System Launch Daemons: ℹ️
  [failed] com.apple.AssetCacheLocatorService.plist [Details]
  [failed] com.apple.awdd.plist
  [failed] com.apple.ctkd.plist
  [failed] com.apple.icloud.findmydeviced.plist [Details]
  [failed] com.apple.ifdreader.plist
  [failed] com.apple.nehelper.plist
  [failed] com.apple.periodic-daily.plist [Details]
  [failed] com.apple.periodic-weekly.plist [Details]
  [failed] com.apple.softwareupdate_download_service.plist [Details]
  [failed] com.apple.spindump.plist [Details]
  [failed] com.apple.wdhelper.plist
  [failed] org.cups.cupsd.plist [Details]
Launch Daemons: ℹ️
  [loaded] com.adobe.fpsaud.plist [Support]
User Launch Agents: ℹ️
  [loaded] com.google.keystone.agent.plist [Support]
User Login Items: ℹ️
  iTunesHelper ApplicationHidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
  Google Drive Application (/Applications/Google Drive.app)
  Google Chrome ApplicationHidden (/Applications/Google Chrome.app)
Internet Plug-ins: ℹ️
  OfficeLiveBrowserPlugin: Version: 12.3.6 [Support]
  FlashPlayer-10.6: Version: 15.0.0.246 - SDK 10.6 [Support]
  Flash Player: Version: 15.0.0.246 - SDK 10.6 Mismatch! Adobe recommends 16.0.0.235
  iPhotoPhotocast: Version: 7.0 - SDK 10.8
  QuickTime Plugin: Version: 7.7.3
  Default Browser: Version: 600 - SDK 10.10
3rd Party Preference Panes: ℹ️
  Flash Player  [Support]
Time Machine: ℹ️
  Mobile backups: OFF
  Auto backup: NO - Auto backup turned off
  Volumes being backed up:
  Macintosh HD: Disk size: 999.35 GB Disk used: 985.37 GB
  Destinations:
  FreeAgent Drive [Local]
  Total size: 1.50 TB
  Total number of backups: 2
  Oldest backup: 2012-07-02 22:00:56 +0000
  Last backup: 2013-05-03 17:52:32 +0000
  Size of backup disk: Too small
  Backup size 1.50 TB < (Disk used 985.37 GB X 3)
Top Processes by CPU: ℹ️
      4% WindowServer
      1% mds_stores
      0% AppleSpell
      0% Google Chrome
      0% Google Drive
Top Processes by Memory: ℹ️
  125 MB Google Chrome
  38 MB Google Chrome Helper
  27 MB mds
  21 MB Finder
  17 MB mds_stores
Virtual Memory Information: ℹ️
  35 MB Free RAM
  1.08 GB Active RAM
  1.06 GB Inactive RAM
  796 MB Wired RAM
  55.71 GB Page-ins
  2.96 GB Page-outs
Diagnostics Information: ℹ️

Answer 1

You need to reinstall Yosemite to fix a corrupted installation. Remove this item:
Startup Items: ℹ️
  HP IO: Path: /Library/StartupItems/HP IO
  Startup items are obsolete in OS X Yosemite
Reinstalling OS X Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Download and install the 10.10.1 update.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Also see:
Reinstall OS X Without Erasing the Drive
OS X Yosemite- Reinstall OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it is three times faster than wireless.