Yesterday I used a pen drive to transfer some files from my Dell Vostro Laptop(Vista Basic) running with Microsoft Security Essentials. MSE detected few viruses and claimed to clean them. But when I accessed the drive I could still see some viruses; every folder had a .exe file of its own name. I again checked the drive with MSE but it detected nothing. Then I unplugged the drive from my PC and shut it down.
Next time when I booted my PC, a window appeared showing my Documents folder, and a black screen appeared when i minimized the window. The desktop and start menu were gone . I was able to access all the programs using task manager (CTRL+SHIFT+DEL). Then I started explorer.exe by clicking New Task and my PC started working normally. But when I again restarted the system, the problem persisted.
Then I uninstalled MSE and installed a trial version of Kaspersky. I scanned my computer with it but it showed nothing. Then I scanned the pen drive I used
previously and it detected 7 instances of "Trojan-Downloader.Win32.VB.hir" which KIS deleted successfully. I believe that this virus has altered my system registries.
Can any one help?