Hi, I have just installed the latest Avast! antivirus in my friend's laptop. Before this, I installed many AVs and didn't have any issue with the Panda USB Vaccine prior their uninstallation. However, once I install Avast, I will get the message from Panda USB Vaccine stated that "Cannot create shell notification system" whenever I start up my friend's laptop. This issue is also encountered in my home PC. At first, I thought it is Panda USB Vaccine issue but now I come to know that it is possibly Avast issue. Thanks and Regards.