Let's face it, one of the primary jobs a Windows admin does is keep machines free of infection. It's inevitable - end users will open files, install cutesy apps, and go to sites they shouldn't. When they do these things, their machines get infected. When their machines get infected, you could wind up fighting a losing battle - unless you have the right tools.
Sometimes the antivirus tools installed on the machine just aren't enough. When that time comes, you'll be glad you have one (or more) tools on your USB drive to help you out. I've found five such tools that could certainly get you out of a serious pinch. All of these tools are portable and work like champs.
1. ClamWin Portable
ClamWin Portable is very much like its big brother: It's free, open source, and does a great job of disinfecting machines. ClamWin has a very high detection rate, has frequently updated definitions, and has an easy to use graphical interface. The only caveat to using ClamWin is that it does not offer a real-time scanner - which is not an issue for a portable version. This is my go-to portable virus scanning software.
2. Sophos Anti Rootkit Portable
Sophos Anti Rootkit Portable is one of those tools you hope you never have to use; but you know, at some point, you will. Sophos is remarkably adept at locating root kits - especially for a portable app. Sophos: scans, detects and removes rootkits, is 100% free, supports Windows XP, Vista and 7, and works alongside your existing antivirus. I have found Sophos reliable enough to use even while the PC being scanned is in use.
3. Emsisoft Free Emergency Toolkit
Emsisoft Free Emergency Toolkit is a powerful malware removal tool that can scan for, and remove, over six million dangers to your PC. Emsisoft Free Emergency Toolkit has both a GUI and a command line version, so you can scan your machine even if there are problems with the GUI. With this toolkit, you not only get the malware scanner, you also get HiJackFree and BlitzBlank as well. Emsisoft offers the free download, or you can purchase a pre-compiled USB stick.
4. Vipre Rescue
Vipre Rescue is that tool you use when your machine is severely infected. Vipre is run in safe mode and does not depend upon a GUI tool for use. You double-click the executable and a command window opens with the scanner running (and running at blazing speeds). If you already use the full version of Vipre, you can still run this tool should your machine become so infected, Vipre will not run.
5. Spybot Search and Destroy Portable
Spybot Search and Destroy Portable is the portable version of the massively popular full Spybot Search and Destroy. This antimalware tool does a great job of finding and removing malicious software - all from your flash drive. Spybot has a unique feature that will help you backup your registry before you begin the scan. Should Spybot fubar your PCs registry, you have a backup to restore to - safe and sound.
You know that point is coming when you'll require the assistance of portable antivirus and/or antimalware. It's a shame that this is such a big part of our jobs, but it is inevitable. Make sure you are always armed with the tools to combat this plague by keeping a few of these portable apps along with you.
Jack Wallen is an award-winning writer for Techrepublic and Linux.com. As an avid promoter/user of the Linux OS, Jack tries to convert as many users to open source as possible. His current favorite flavor of Linux is Bodhi Linux (a melding of Ubuntu and Enlightenment). When Jack isn't writing about Linux he is hard at work on his other writing career -- writing about zombies, various killers, super heroes, and just about everything else he can manipulate between the folds of reality. You can find Jack's books on Amazon, Barnes & Noble, and Smashwords. Outnumbered in his house one male to two females and three humans to six felines, Jack maintains his sanity by riding his mountain bike and working on his next books. For more news about Jack Wallen, visit his website Get Jack'd.