An analysis of your HJT log shows the following problems :
We didn’t detect any active process of a firewall on your system. Reasons maybe:
(1.) You are using the windows firewall or a hardware firewall.
(2.) You are using a firewall of an unknown vendor.
(3.) You are using a firewall, but for unknown reasons it is disabled
(4.) You don’t use any firewall at all.
We recommend you to use a firewall.
O4 - HKUS\S-1-5-18..\Run: [braviax] (User ‘SYSTEM’)
Startup entry for the Trojan.Virantix.C trojan.
http://www.bleepingcomputer.com/startups/braviax.exe-21759.html
O4 - HKUS.DEFAULT..\Run: [braviax] (User ‘Default user’)
Same as above. I suggest you use malwarebytes antimalware for removal.
http://www.malwarebytes.org/mbam.php (download the free version, install it, update it, run a scan, and allow it to fix/remove what it finds.
About those 3 ActiveX entries L’Arc mentioned :
O16 - DPF: {O16 - DPF: {233C1507-6A77-46A4-9443-F871F945D258} (Shockwave ActiveX Control) -
Related to macromedia.
http://www.spyandseek.com/Search.php?search_for=233C1507-6A77-46A4-9443-F871F945D258&search=SAS-Search (12th & 13th entries on list)
O16 - DPF: {33415AC7-AFFA-4D55-B41C-C64C0D07DFCA} -
Related to Hewlett-Packard Printer Diagnostics.
http://www.spyandseek.com/Search.php?search_for=33415AC7-AFFA-4D55-B41C-C64C0D07DFCA&search=SAS-Search (1st entry on list)
O16 - DPF: {A796D216-2DE1-4EA8-BABB-FE6E7C959098} -
Related to Hewlett-Packard support.
http://www.spyandseek.com/Search.php?search_for=A796D216-2DE1-4EA8-BABB-FE6E7C959098&search=SAS-Search (3rd & 4th entries on list)
I do not think there is any worry about those 3 above entries.
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
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
AppleMobileDeviceService.exe
Backgroundtask
Apple Mobile Device Service
mDNSResponder.exe
Backgroundtask
Bonjour for Windows Component
btwdins.exe
System task
Microsoft Bluetooth Service
svchost.exe
System task
Microsoft Service Host Process
Iaantmon.exe
Driver
Intel Application Accelerator Component
jqs.exe
Backgroundtask
jqs.exe (Java Quick Starter)
svchost.exe
System task
Microsoft Service Host Process
PD91Agent.exe
Backgroundtask
PD91Agent ( Perfectdisk agent )
svchost.exe
System task
Microsoft Service Host Process
Explorer.EXE
System task
Microsoft Windows Explorer
svchost.exe
System task
Microsoft Service Host Process
ashDisp.exe
Virusscan
Avast AntiVirus
realsched.exe
Application
RealNetworks Scheduler
jusched.exe
Backgroundtask
Sun Java Update Scheduler
stsystra.exe
Driver
SigmaTel C-Major Audio Tray App
igfxpers.exe
Driver
Intel Common User Interface Module
iTunesHelper.exe
Application
Apple Itunes
issch.exe
Application
InstallShield Update Service
Iaanotif.exe
Driver
Event Monitor User
mpm.exe
Backgroundtask
Reports battery status on a portable printer
HPWuSchd2.exe
Backgroundtask
Hewlett Packard Software Update Scheduler
hkcmd.exe
Application
Intel multimedia devices
GoogleDesktop.exe
Backgroundtask
Google Desktop Search
DMXLauncher.exe
Backgroundtask
Dell Media Experience
DLACTRLW.EXE
Backgroundtask
Sonic Solutions Drive Letter Access (DLA)
Reader_sl.exe
Backgroundtask
Adobe Reader Speed Launch
Reader_sl.exe
Backgroundtask
Adobe Reader Speed Launch
Acrotray.exe
Backgroundtask
Acrobat Traybar Assistant
GoogleToolbarNotifier.exe
Backgroundtask
GoogleToolbarNotifier
TeaTimer.exe
Application
Spybot S&D Realtime Scanner
AcroDist.exe
Backgroundtask
Adobe Acrobat Distiller
MMonitor.exe
Backgroundtask
TMMonitor
MsnMsgr.Exe
Application
MSN Messenger
MsnMsgr.Exe
Backgroundtask
MsnMsgr.Exe
ctfmon.exe
System task
Alternative User Input Services
acrobat_sl.exe
Backgroundtask
Adobe Acrobat Speed Launcher
BTTray.exe
Driver
Widcomms Bluetooth Tray Application
DLG.exe
Backgroundtask
Detects whether your are plugged into a digital telephone line and displays the information graphically.
GoogleDesktopIndex.exe
Backgroundtask
Google Desktop Search
hpqtra08.exe
Backgroundtask
Hewlett Packard Imaging
EasyShare.exe
Backgroundtask
Software bundled with Kodak digital cameras to manage the connection between the PC and the Camera.
BTSTAC~1.EXE
Driver
Bluetooth Stack COM Server
msoffice.exe
Backgroundtask
Microsoft Office Shortcut Bar
wuauclt.exe
System task
AutoUpdate Client
ashMaiSv.exe
Virusscan
Avast Anti-Virus Component
ashWebSv.exe
Virusscan
avast! Web Scanner
iPodService.exe
Backgroundtask
Apple iTunes
hpqSTE08.exe
Driver
HP Imaging
hpqbam08.exe
Driver
HPQBAM00
hpqgpc01.exe
Driver
GPRootImpl.exe
HijackThis.exe
Application
Merijn Hijackthis