imac running very slow

after reinstall snow leopard computer running very slow with spinning beach ball at times.

ertrecheck output as follows

please help

EtreCheck version: 2.1.8 (121)

Report generated 29 March 2015 12:03:54 GMT+01:00

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: ℹ️

iMac (27-inch, Late 2009) (Technical Specifications)

iMac - model: iMac10,1

1 3.06 GHz Intel Core 2 Duo CPU: 2-core

4 GB RAM

BANK 0/DIMM0

Empty

BANK 1/DIMM0

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

Display 2560 x 1440

spdisplays_display_connector

System Software: ℹ️

Mac OS X 10.6 (10A432) - Time since boot: 0:20:19

Disk Information: ℹ️

WDC WD1001FALS-40U9B0 disk0 : (931.51 GB)

Mac OS X Install DVD (disk0s2) / : 999.86 GB (988.42 GB free)

OPTIARC DVD RW AD-5680H

USB Information: ℹ️

Apple Inc. Built-in iSight

Apple Internal Memory Card Reader

Apple Computer, Inc. IR Receiver

Apple Inc. BRCM2046 Hub

Apple Inc. Bluetooth USB Host Controller

Problem System Launch Daemons: ℹ️

[failed] com.apple.DumpPanic.plist [Click for details]

[not loaded] org.samba.winbindd.plist [Click for support]

User Launch Agents: ℹ️

[failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist [Click for details]

User Login Items: ℹ️

None

Internet Plug-ins: ℹ️

QuickTime Plugin: Version: 7.6.3

Flash Player: Version: 10.0.23 Outdated! Update

Audio Plug-ins: ℹ️

iSightAudio: Version: 7.6.3

3rd Party Preference Panes: ℹ️

None

Time Machine: ℹ️

Time Machine information requires OS X 10.7 "Lion" or later.

Top Processes by CPU: ℹ️

3% WindowServer

1% fontd

0% SystemUIServer

0% Safari

0% usbmuxd

Top Processes by Memory: ℹ️

258 MB Safari

43 MB mds

43 MB WindowServer

21 MB Finder

13 MB Dock

Virtual Memory Information: ℹ️

3.04 GB Free RAM

555 MB Active RAM

198 MB Inactive RAM

505 MB Wired RAM

122 MB Page-ins

0 B Page-outs

Diagnostics Information: ℹ️

Mar 29, 2015, 11:43:37 AM Self test - passed