Avast has identified Win32:DyfucDldr-AC as being in my Outpost Firewall program. Is this a case of an anti-virus program (Avast) seeing part of a firewall program (Outpost) as a virus?
BTW I just re-installed Outpost today, to make sure it is clean. (Unless a real Win32:DyfucDldr-AC bug got right back in immediately.)
This is a commonly reported fault of outposts antispyware plug-in in that its signature files aren`t encrypted .If you have ad-aware already then you certainly dont need to activate this one as they are identical.
see links http://forum.avast.com/index.php?topic=19544.msg164444#msg164444
http://forum.avast.com/index.php?topic=19510.msg164641#msg164641
http://forum.avast.com/index.php?topic=3679.msg26351#msg26351
[Downaload and run ccleaner here: www.ccleaner.com
did the job for me even after reboot.!!
rollock
CCleaner should have no effect in this case, the file isn’t a temporary one or in a temp location and is in use, so CCleaner wouldn’t touch it.
However, it is a handy tool for cleaning temp files as is ClearProg - Temp File Cleaner
I’ve been getting repeating detections for Win32:DyfucDldr-AC[Trj] by my Avast in a program folder for my ‘CounterSpy Threat Engine’ Antispyware and in my ‘Recycler’ program.My Avast detects them but can’t seem to handle/quarantine them properly, hard time moving to the chest.Still for the past 2 weeks since Avast got this new virus definition, my thorough scans detects them again and again;Avast can’t move or quarantine or delete them, even after several boot scans too.What’s going on: is this definiton a false postive? is this trojan just too hard to get rid of? does anybody else have a similar problem with this definition?should I get the better McAfee Virus software?
The file should being blocked by the CounterSpy or being ‘regenerated’ after boot (when you clean by avast boot time scanning).
To know if a file is a false positive, please submit it to JOTTI and let us know the result. If it is indeed a false positive, send it in a password protected zip to virus (at) avast.com
Please, mention in the body of the message why you think it is a false positive and the password used.
I can only guess that, probably, this seems a problem of ConterSpy doesn’t encryting its signatures 
Why? Just because a false positive or trouble? Did you receive support for free by McAfee? 
You don’t state the supposed infected file name or its location, this helps to identify if it is a false positive due to a virus signature file that may be unencrypted. Please post this information and do as Tech suggests and scan the file using the multi engine Jotti on-line scan.
If it is detecting the unencrypted malware signatures in CounterSpy (which we can’t know for sure until you provide the information asked for above), this can hardly be classed as a false positive or a failing of avast. How is avast to know what the purpose of the signature is, it can’t.
You can get a good idea what it is from the above information about Outpost’s anti-spyware signatures and other threads about this that it is likely to be an unencrypted signatures file (but you need to confirm this), all you need do is add the file name to the avast Program Settings and Standard Shield exclusions.
Edit: Also see this thread http://forum.avast.com/index.php?topic=19681.0
should I get the better McAfee Virus software?Well, in my opinion, McAfee is surely inferior to Avast. I say this because I am an ex-McAfee user ... let my computer get infected without me knowing it and then gave me sorry support ... no, make that no support! I came to realize that infection had been on the computer for several months. Thanks, McAfee! >:(
Here, with Avast, you will find all the support of knowledgable users as well as the Avast team members. All you have to do is ask for it and give us the relevent information to your problem. Not only do you get help with any Avast or virus problem, check out the General forum for help in many other computer related areas. 
Just try getting this kind of service from McAfee. :