I have recently purchased a new custom built PC on which Malwarebytes was installed. The first time I ran it after buying the PC it found two infections which I removed. However, when I next came to boot up the PC it couldn't even run through the BIOS until I isntalled the Windows disk and did a repair - not a good start for a new PC! I have now run Malwarebytes again and the same infection has re-appeared giving the following logfile:
Malwarebytes' Anti-Malware 1.37
Database version: 2233
Windows 5.1.2600 Service Pack 3

06/06/2009 14:05:32
mbam-log-2009-06-06 (14-05-26).txt

Scan type: Quick Scan
Objects scanned: 87120
Time elapsed: 1 minute(s), 1 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 2
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{549b5ca7-4a86-11d7-a4df-000874180bb3} (Trojan.Agent) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{549b5ca7-4a86-11d7-a4df-000874180bb3} (Trojan.Agent) -> No action taken.

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

Is this infection real or is it a false postive? I don't want to find I can't boot the PC again if I remove the alleged infections. If they are real how do I stop them getting back on my PC if they are real? I use AVG free as my anti-virus and it finds nothing when run and the Windows firewall.
Thanks for any help on this one.

Yes, it's a real infection.

Greetings.

To get you fixed up please follow the instructions here:
I'm infected - What do I do now?

And post your logs in a new topic here:
Malware Removal - HijackThis Logs

Please be sure not to install any software or use any removal or scanning tools exept those that you are
instructed to by the expert who will be assisting you as doing so can make their job much more difficult.

note: if for some reason you are unable to run some or any of the tools in the first link, then skip that step and move on to the next one.
If you can't even run HijackThis, then just post here: Malware Removal - HijackThis Logs describing your issues and an expert will reply with further instructions.

I hope I was helpful. Good luck and safe surfing.