Need help with recurring virus

Doing good, except why did you download Comodo? Did you uninstall both Avira and Avast?

Please download TFC by Old Timer TFC - Temp File Cleaner by OldTimer - Geeks to Go Forums and save it to your desktop.
Save any unsaved work. TFC will close ALL open programs including your browser!
Double-click on TFC.exe to run it. If you are using Vista/Windows 7 right-click on the file and choose Run As Administrator.
Click the Start button to begin the cleaning process and let it run uninterrupted to completion.
Important! If TFC prompts you to reboot, please do so immediately. If not prompted, manually reboot the machine anyway to ensure a complete clean.

Next, your Java is out of date. Older versions have vulnerabilities that malware can use to infect your system. Please follow these steps to remove older version Java components and update.


Updating Java:

• Download the latest version of Java Runtime Environment (JRE) 7.
  Java SE Downloads
• Scroll down to where it says "Java Runtime Environment (JRE) 7u2 allows end-users to run Java applications".
• Click the "Download" button to the right.
• Check the box that says: "Accept License Agreement".
• The page will refresh.
• Click on the link to download Windows Offline Installation with or without Multi-language and save to your desktop.
• Close any programs you may have running - especially your web browser.
• Go to Start > Control Panel double-click on Add/Remove programs and remove all older versions of Java.
• Check any item with Java Runtime Environment (JRE or J2SE) in the name.
• Click the Remove or Change/Remove button.
• Repeat as many times as necessary to remove each Java versions.
• Reboot your computer once all Java components are removed.
• Then from your desktop double-click on jre-7u2-windows-i586-p.exe to install the newest version.
• Uncheck any browsers bundled with this installation!!

Do you have free Avira? What's the error that Windows firewall gives?

Do you still have Prevx installed?

Okay, now we're going to uninstall Combofix:

Click on the Start button and then select Run from the menu. This will open up the Run box.
Copy/Paste combofix /uninstall (Please note that there is a space between combofix and /uninstall), click on the OK button or Enter on your keyboard.
You can now delete the ComboFix.exe program from your computer

Next, I want you to download and install Hijackthis! HijackThis - Trend Micro USA
Right click to run the program as Administrator, then click 'Do a System Scan and Save logfile'.
The HJT log will open in notepad.
Copy and paste the HJT log from notepad

Let it go, then delete the Combofix.exe from your desktop