Just like every home has a First Aid Kit formedical emergencies, it pays to have something similar for your PC. All you need is a pen drive that's loaded with essential, troubleshooting software. The tools listed in this piece are free, and run straight out of a USB stick, so you don't even need to install them. And yes, it also means you can carry this 'First Aid Kit' along whenever you want to help friends with their computer problems... ClamWinThe portable version of ClamWin antivirus can be used to scan your PC for viruses. This is extremely useful because malware can sometimes disable the antivirus software installed on your PC. With ClamWin on your flash drive, you will be able to identify and remove infections.To keep your PC spic-andspan, you will also need to routinely scan it for spyware and adware. These are pesky programs that get installed along with free software, or if you might have clicked on an unknown web link in an e-mail. To take care of these malicious programs, also keep SpyBot - Search