Please could someone take a look

First....ComboFix is reporting multiple AV and Firewall apps:
AV: Lavasoft Ad-Watch Live! Anti-Virus *On-access scanning disabled* (Updated) {A1C4F2E0-7FDE-4917-AFAE-013EFC3EDE33}
AV: Prevx 3.0 *On-access scanning enabled* (Updated) {D486329C-1488-4CEB-9CC8-D662B732D901}
FW: Filseclab Personal Firewall *disabled* {EB4DA513-3B0A-4FCB-86A7-F1243757EFF2}
FW: Norton Internet Worm Protection *disabled* {990F9400-4CEE-43EA-A83A-D013ADD8EA6E}
FW: PC Tools Firewall Plus *disabled

Plus there are traces of AVG as well as Norton in your logs.

You should uninstall:
ThreatFire
Filseclab Firewall or PC Tools Firewall since only one should be installed.
Prevx 3.0

Your logs are clean of malware, so I suggest that you post in the software forum for additional assistance.

We can remove the above items if you so want assistance with that.



Since you are not having any other malware problems, it is time to do our final steps:

1. We recommend you keep SUPERAntiSpyware and Malwarebytes Anti-Malware for scanning/removal of malware. Unless you purchase them, they provide no real-time protection. They are useful as backup scanners.They do not use any significant amount of resources ( except a little disk space ) until you run a scan.
2. If we had you use ComboFix, uninstall ComboFix (This uninstall will only work as written if you installed ComboFix on your Desktop like we requested.)
   
   • Click START then RUN and enter the below into the run box and then click OK. Note the quotes are required
   • "%userprofile%\Desktop\combofix" /uninstall
     
     • Notes: The space between the combofix" and the /u, it must be there.
     • This will uninstall ComboFix and also reset hidden files and folders settings back to Windows defaults.
3. Any other miscellaneous tools we may have had you install or download can be uninstalled and deleted.
4. If running Vista, it is time to make sure you have reenabled UAC by double clicking on the C:\MGtools\enableUAC.reg file and allowing it to be added to the registry.
5. Go to add/remove programs and uninstall HijackThis.
6. Goto the C:\MGtools folder and find the MGclean.bat file. Double click on this file to run this cleanup program that will remove files and folders related to MGtools and some other items from our cleaning procedures.
7. If you are running Vista, Windows XP or Windows ME, do the below:
   
   • Refer to the cleaning procedures in step 3 the READ ME for your Window version and see the instructions to Disable System Restore which will flush your Restore Points.
   • Then reboot and Enable System Restore ato create a new clean Restore Point.
8. After doing the above, you should work thru the below link:
   
   • How to Protect yourself from malware!

 

You have a G:\ drive....which is what RootRepeal is reporting:
Volume G:\
Status: MBR Rootkit Detected!

Your C:\ drive is where your MBR is, not the G:\ drive.

And you are most welcome.