An analysis of your last HJT log :
A newer version of service pack is available. Service packs increase the safety of your system. Visit Microsoft’s windowsupdate site to download the newest version of the service pack.
C:\Program Files\Viewpoint\Common\ViewpointService.exe
Possibly BAD. Check if you know this process and arrange a viruscheck where required. Related to viewpoint which is usually considered foistware, usually installed with AOL.
O23 - Service: AST Service (astcc) - Unknown owner - C:\WINDOWS\SYSTEM32\astsrv.exe (file missing)
astsrv.exe is a process from Nalpeiron Highend Service by Nalpeiron Ltd. and part of Nalpeiron Support File. If you are no longer using this service (file missing), this entry can be fixed. It should not hurt to leave it if you so desire.
http://www.backgroundtask.eu/Systeemtaken/Taakinfo.php?ID=15159
This executable is related to Software Copy Protection, Digital Rights Management, and Electronic Software Licensing.
http://www.nalpeiron.com/ and http://www.nalpeiron.com/products/
There were a few other questionable entries but they should be ok and no files were missing.
Overview of running tasks :
smss.exe
System task
Session Manager Subsystem
winlogon.exe
System task
Microsoft Windows Logon Process
services.exe
System task
Windows Service Controller
lsass.exe
System task
Local Security Authority Service
svchost.exe
System task
Microsoft Service Host Process
aswUpdSv.exe
Virusscan
Avast Anti-Virus Component
ashServ.exe
Virusscan
Avast
spoolsv.exe
System task
Microsoft Printer Spooler Service
IntuitUpdateService.exe
Unknown task
Unknown task
http://www.pcpitstop.com/libraries/process/i/IntuitUpdateService.exe.html
MDM.EXE
Backgroundtask
Machine Debug Manager
NBService.exe
Backgroundtask
Nero BackItUp
NBService.exe
Backgroundtask
Nero BackItUp
nvsvc32.exe
Application
NVIDIA Driver Helper Service
svchost.exe
System task
Microsoft Service Host Process
ViewpointService.exe
Backgroundtask
View Manager Service
ashMaiSv.exe
Virusscan
Avast Anti-Virus Component
ashWebSv.exe
Virusscan
avast! Web Scanner
ctfmon.exe
System task
Alternative User Input Services
SUPERAntiSpyware.exe
Anti Add/Spyware software
SUPERAntiSpyware
svchost.exe
System task
Microsoft Service Host Process
HijackThis.exe
Application
Merijn Hijackthis
taskmgr.exe
System task
The Windows Task Manager.
explorer.exe
System task
Microsoft Windows Explorer