PC Security Compromised?

[pcguideuser745]

So here's the deal: I open Steam and start a Dedicated Server, and after several minutes, my computer "crashes" very strangely. The computer is still responsive, but my screen flickers on and off...I see some apps in the background are sort of doing their own thing. I immediately shut down my computer. I power up again almost immediately, double check my firewall settings, and run a full system virus scan which comes up clean. (Btw does anyone know the difference between NOD32 On-Demand Scanner and In-Depth Scanner?)

My question is: how do I know if I have been hacked? I feel as if someone may have accessed my computer, since running the Dedicated Server requires me to open some additional ports on my computer. What are the symptoms of being hacked? If I was hacked, do I now have anything to worry about since i no longer have the Dedicated Server running?

I have also attached a HiJackThis Log below

[pcguideuser745]

Logfile of HijackThis v1.99.1
Scan saved at 11:51:05 AM, on 10/15/2006
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\SOUNDMAN.EXE
C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
C:\Program Files\Eset\nod32kui.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
C:\Program Files\Viewpoint\Viewpoint Manager\ViewMgr.exe
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_S4I2R 1.EXE
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Winamp\winampa.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Program Files\Cisco Systems\Clean Access Agent\CCAAgent.exe
C:\Program Files\Eset\nod32krn.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\Steam\steam.exe
C:\Program Files\Trillian\trillian.exe
C:\Program Files\Mozilla Firefox\firefox.exe
D:\Andrew's Stuff 2\HijackThis.exe

O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [nod32kui] "C:\Program Files\Eset\nod32kui.exe" /WAITSERVICE
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
O4 - HKLM\..\Run: [ViewMgr] C:\Program Files\Viewpoint\Viewpoint Manager\ViewMgr.exe
O4 - HKLM\..\Run: [EPSON Stylus C86 Series] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_S4I2R 1.EXE /P23 "EPSON Stylus C86 Series" /O6 "USB001" /M "Stylus C86"
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [WinampAgent] C:\Program Files\Winamp\winampa.exe
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKCU\..\Run: [Steam] "c:\program files\steam\steam.exe" -silent
O4 - Startup: Trillian.lnk = C:\Program Files\Trillian\trillian.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Clean Access Agent.lnk = C:\Program Files\Cisco Systems\Clean Access Agent\CCAAgent.exe
O8 - Extra context menu item: &eBay Search - res://C:\Program Files\eBay\eBay Toolbar2\eBayTb.dll/RCSearch.html
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: AIM - {AC9E2541-2814-11d5-BC6D-00B0D0A1DE45} - C:\Program Files\AIM\aim.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {48884C41-EFAC-433D-958A-9FADAC41408E} (EGamesPlugin Class) - [url]https://www.e-games.com.my/com/EGamesPlugin.cab[/url]
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - [url]http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1150568898390[/url]
O16 - DPF: {CD995117-98E5-4169-9920-6C12D4C0B548} (HGPlugin9USA Class) - [url]http://gamedownload.ijjimax.com/gamedownload/dist/hgstart/HGPlugin9USA.cab[/url]
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: NOD32 Kernel Service (NOD32krn) - Eset - C:\Program Files\Eset\nod32krn.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

[pcguideuser745]

Can anyone offer any advice? Does the HJT log above look alright?