I’m using the latest Avat Professional 4.6 and it seems that this antivirus detect much less viruses than other antivirus programs.
Par example it doesn’t detect many trojans and so on.
I cheked in my my avast virus definitions database an it has only 40 000 virus records. (The other antiviruses have much more)…
I don’t know if in nearest future this virus definitions database will as well as I hope…
Those numbers don’t mean anything, avast e.g. detects many variants of one virus/malware under a single name
→ it detects as many viruses as other AVs, and recently got the VB100 award for this:
http://forum.avast.com/index.php?topic=12460.new#new
http://www.virusbtn.com/vb100/archives/products.xml?table
There you can see that avast passed the last Windows test, while e.g. McAfee & F-Prot failed (for whatever spurious reasons) 
Please browse the board for numerous discussions on this topic
Quote: Those numbers don’t mean anything, avast e.g. detects many variants of one virus/malware under a single name
→ it detects as many viruses as other AVs, and recently got the VB100 award for this:
So then why I found about 10 viruses after using different online scaners susch as:
Bit Defender, McAfee, Panda Antivirus and F-Secure (you still think that it’s impossible?! I used all these online scaners…)
Something is wrong…
Nothing is wrong… what are the names of those viruses you claim avast! didn’t find and other online scanners found on your computer. Let us know about those names… it is possible that avast! couldn’t pick up some of them, but 10 different viruses like you said in your previous post… not likely…
NO VirusScanner detects everything, and that’s a fact
So other AV’s could find stuff avast doesn’t, as well as avast will also detect stuff other’s don’t, but all that is totally unrelated to the number 40000 of viruses listed in avast’s database
P.S.: it might be a good idea to include the location of those viruses (path/folder/filename…)
I assume they weren’t just found in avast’s quarantine/moved folder…?
and that you did a complete, thorough scan with archive scanning enabled with Uptodate avast beforehand ?
I got a pretty fine problem… 
The virus (I don’t know exactly whichone) has disabled my desktop (there was a advertising picture).- I deleted it, but the desktop is still locked. Also is locked mouse right click in desktop and windows explorer. But right click works in internet explorer and in task bar.
I removed all viruses runin Mcafee ant Kaspersky antiviruses.
Any ideas how to enable right click?! (configuring in control panel doesn’t help).
The things that you are describbing are more likely to be Adware/spyware so these specialist programs (freeware) could help. If you haven’t got them, download, install, update and run them.
For hijackthis - For an on-line scan of your Hijackthis log file try here http://hijackthis.de/index.php
Thanks for advice, but this doesn’t work. Few days ago I’ve already tried
Ad-Aware Professional
Xoft spy
and even spybot
I was infected with several trojans and so on:
(Virus definitions according to Avast Pro)
Win32:Haxdoor
Win32:Mhtplo-8 [Trj]
Win32:Dialer-E [Trj]
Win:32Spyda-B
Win32:StartPage-086 [Trj]
Avast messages were po-uping all the time: Virus could not be deleted
So I ran boot time scan with maximal scaning ability
Avast noted that viruses were deleted, but after that my desktop was totaly locked
I ran McAfee scan and it detected that the viruses noticed by avast as deleted indeed were not deleted!
Next day I ran Kaspersky - it found 10 infected file (they were not found neither by avast neither by mcafee)
It seems to be a registry problem…
If I remember rightly there has been a thread about Haxdoor in these forums and it is proving to be very difficult to remove.
Check out this thread - http://forum.avast.com/index.php?topic=12445.0
Finally I fixed my problem- (now right click works perfectly in desktop and in any disk place).
but not by anti-spyware or hijack this as you consoled me, but simply by manually adding 2 new values to the registry.
And as i said it seemed to be a registry problem and it realy was!
Thanks anyway