Some of the related Symptoms of the problems are as under:
- Web-browser downloads the .exe files. Progress bar shows download progress, but when reaches 100 %, the downloaded .exe files disappears.
- In Windows 7/Vista/XP based computer.
- Antivirus Application for example: AVG shows updated virus definition would not scan the computer.
The system is possibly infected with Virus/Trojan/Spyware. There is a very good spyware and malware removal program Spybot Search & Destroy (S&D) compatible with Microsoft Windows. It scans the computer hard disk and/or RAM for malicious software. It can be downloaded from http://www.safer-networking.org/en/spybotsd/index.html . It can also directly be installed/run from a removable media CD/DVD/USB/Flash drive ( http://forums.spybot.info/archive/index.php/t-3191.html).
Snap given below shows a Trojan detected below by Spybot-S&D: