Hello all, given the symptoms of Sirefef-A, I'm surprised that googling actually brought up this Forum, and not a number of junk-links. I have spent some time reading other topics, both here, and on the avast forums, about the Sirefef Virus variations, and since everyone says not to use the fixes that other users were given, I decided to post my issues too. The trouble started when I had my PC running overnight on Sunday, something I rarely do. The next morning when I got back to it, everything was pretty much frozen, so I had to close myself out of every program running. Since then, I have had problems to get my main broswer (Opera) to start, as it froze up with every startup. I then tried to copy the folder from my H drive, which is rather small with its 30 gig, believing that it was a memory issue, but I got the error E/A 1450, saying there were no system resources available. I then just installed a new version of Opera on another drive, and deleted the original installation from H, hoping that fixed it. But being paranoid as I am, I started a virus scan, and got a couple of results. Ever since that first virus scan, I have had Avast warn me of threats about every ten to twenty minutes, those threats being Win64:Sirefef-A, Win32:Atraps-PF and Win32:Malware-gen, all of them being triggered by the Explorer.exe. According to Avast, these items are stored in my user data, but have immediately been quarantined by Avast. I tried removing Sirefef-PF via Avast, but found out that it's linked to my desktop.ini, so I couldn't delete it. Since then, Avast has also found it in system recovery files. I'm running Windows XP with Service Pack 3, I have Avast with a purchased full license as my virus guard. I did not notice any other memory problems, other than the Opera freezing, my Google results have not seemed in any way weird. All of the viruses have been moved to quarantine, the quarantined files have not been deleted. What can I do, what programs should I used to get rid of it, what logs need to be posted? I have a 1 gig USB stick at my disposal, will that be enough? In terms of logs, all I have is a Hijack This Log, I hope that helps for a first glimpse. I'll post it on the next post.