Hi, I'm not sure if I am posting to the right section of the forum. An Avast scan has told me I have Malware. There seem to be three areas infected with the Win32 dialer 650 trojan. Avast was unable to move the infected files to the virus chest and was unable to repair the files. Two files are in the C:/"system volume information" folder, the other is in a programme I have never installed in online services : BT Yahoo!. I am unable to delete this file or remove the programme from my system (I get error messages saying I am not allowed to remove it). It came with the computer. I've also scanned with spybot and AVG anti spyware and they do not pick up the infected files (AVG picked up some infected cookies and deleted them, spybot picked up various adware files and deleted those). I don't understand how I could have been infected as I did a full scan offline with Avast only a couple of weeks ago and all was clean. Maybe I didn't use thorough enough settings that time. I've also now updated windows with the latest updates. The reason I did a full scan was because I have zone alarm firewall installed and yesterday it picked up LSA Shell (export version) trying to access the internet. I denied access and have now blocked the programme on zone alarm. When I started to read about LSA shell I found it to be an adware dialer host. I am now panicking in case someone is trying to dial premium rate numbers via my pc. I have a phone bill dated 11th Oct which is ok. I'm hoping zone alarm will have blocked any callers. I'm also planning to tell the phone company to block any premium numbers on that line. Not sure what else I can do as I seem to be unable to remove the trojan from the files (they are BT dll files so I assume I need this to connect to a british telecom line?). Sorry I don't have the full details as Avast for some reason won't allow me to access the scan report at the moment. Will post more if it lets me do this online. Please help, any advice would be much appreciated!