I'm using Windows 7 64-bit and updating Avast Free 5.0.667 (clean install on this version) to the latest 5.1.864 through GUI. Restarting my computer after the update and still see the old version number in Avast GUI and Windows Programs and Features (Control Panel). I try updating it through GUI again and it says it's already updated. Then, I noticed problem with all shields component which shows 0/0 at scanned/infected. Searching this forums and I repair Avast installations using Programs and Features in Control Panel. Restarting my computer and all seems OK (the version number and all the shields).
I do a small test by inserting DVD which contains harmless (music, video, pictures, document, etc) and malware (old and new viruses, trojans, dialers, keyloggers) I've found from internet and other sources. Avast 5.0.667 warn me in an instant the moment I open the folder which contains harmless and malware infected files which means the File System Shield warn me about the existence of this malware on access basis. However, the new version didn't do this.
Perplexed by this, I try to to scan the folder and Avast did find the malware though it missed two infected files (virus kind) which recognized before by the 5.0.667.
I try to copy the malware and malware infected files to my hard drive. Avast warn me and seems to delete the virus and dialers upon arrival (which shows by file with 0 kb size at destination folder), though it missed all trojans and keyloggers. I never tried this before with Avast 5.0.667, so I can't say much about this.
I can't test whether the Network Shield and Web Shield running OK, since I don't want to risk it with unknown dangers (it seems to scan all my web activity and I did try the eicar site, but who knows?).
So, can anyone confirm about this? I'm wondering because I'm going through a bad update.