These days, USB drives, thumb drives, pen drives, portable drives are getting more and more popular to be used in offices and homes replacing those diskettes and CDs due to their small portable, larger capacity and erasable features. The USB drive can be a fast plug-and-play device to make to a program start automatically, transfer files from one PC to another PC. As a result, this is how the Virus, Spyware, Malware, etc can spread easily. That is why usually most computers nowadays even without internet connection may come with at least an antivirus or antispyware program.
But, if your PC protection programs failed to detect any malicious files inside the USB drive, then your PC are infected! Vitality of the condition depends on the malicious file format, sometimes a tiny malicious file may cause damage to your whole system.
To solve this, you can install a Free USB Firewall that is capable to alert a user when USB peripheral attempts to auto start a potentially malicious file.
Once detected any malicious files, you can easily delete them with just one button click. If your PC do not have a powerful antivirus program installed, then this is a must have tool for you before plugging in any USB devices to your PC.