What to do when you suspect your computer has a virus or spyware infection
August 11th, 2008Spyware and/or viruses can infect your PC at any moment without proper protection, and can range from minor nuisances to major problems resulting in slow PC performance or loss of data. Over the last six years I have helped my clients battle this perpetual threat, and I am almost always surprised at the inventiveness of those whom develop spyware and viruses, or ‘malware’ as it is sometimes referred to. So the big question many people ask is “do I have a virus, or do I have spyware?” Usually it’s a mixture of both. Perhaps we should examine all the types of malware out there first.
- A virus typically hides inside of another program (or ‘host’) and cannot cause harm until that program has been started, or ‘executed’. This is pretty much how viruses have worked over the last 20 years or so. However, there are other kinds of viruses that lurk out there, such as ‘worms’ that do not require host programs to become active. ‘Trojan horse’ viruses appear to be harmless at first, can cause major damage, and are nearly undetectable by some scanning programs.
- Spyware has the ability to spy on your website viewing habits, or even worse harvest personal information from your computer. Spyware can also cause random pop-ups to appear, make your browser redirect you to sites where viruses can infect your computer, or in extreme cases make your computer dial expensive long distance numbers (for those using a dial-up connection).
- A rootkit is a program (or combination of several programs) designed to take fundamental control of a computer system, without authorization by the system’s owners and legitimate managers. These are a relatively recent phenomenon, and can sometimes be found in the unlikeliest of places (i.e. when Sony BMG caused a scandal by including rootkit software on music CDs which altered the Windows OS to allow access to anyone aware of the rootkit’s installation. Supposedly, this was done to enforce copy protection of the music on the CDs. The scandal following the discovery and subsequent public notice of this corporate-sponsored malware—a scandal made much worse by the clumsy, insufficient, evasive, and misrepresentative statements of Sony executives—made many users previously unfamiliar with rootkits wary. - quoted from Wikipedia entry)
So what do you do if you suspect you have any of the above, or want to protect you system from future infections? Thankfully there are plenty of good, free tools out there to get the job done. I’ve been using them for over 6 years now and recommend them to all of my clients, none of which have complained about infections since.
- First on my list is Grisoft’s AVG Anti-virus Free Edition, which is an award-winning program that does an amazing job of removing viruses and other nasties from your computer. In fact, in my experience it has caught viruses that both Norton and McAfee have missed! It’s a quick, easy install and doesn’t slow your system down like other protection programs do. Better yet, you can selectively choose any file or folder for scanning, or let AVG automatically handle scanning duties at any time you choose. If you have $50 to spare, go ahead and get the full-featured version which includes a comprehensive collection of spyware and anti-rootkit software.
- Second on my list is Lavasoft’s Ad-Aware Free 2008, which is dedicated to eliminating all varieties of spyware, including any cookies on your computer that could lead to future infection. Once again, the full-featured version offers more features, but the free version is plenty good for those suspecting that their computer is infected.

- Threatfire is a newcomer to the scene, and is a unique product in that it provides a hybrid service. It works as a “live” anti-spyware/anti-virus tool and will catch anything as it tries to come in to your computer. It’s a quick download, it’s free, you should really have this.
- Every now and then a client has a computer that has a particularly nasty bit of malware that simply cannot be removed by most programs. That’s where HijackThis comes in. This powerhouse of a program is not for the novice user and usually requires intermediate or advanced computer knowledge to operate. It’s unique in that it scans your system, creates a log file which you upload to their website, and are then presented with a list of which items in the list are ‘nasty’ or ’safe’. Truly unique, and a must-have for difficult malware situations.
I could go on with a longer list, but to be honest the above four programs are pretty much all I need to do battle with the infections I encounter on PCs. Sure, there are those rare occasions where a more specialized tool is needed, but for 95% of malware infections these should do the job! If you have any questions, comments, or wish to add your own recommendations, send me a line!
Happy hunting!
Brian Kenney @ Your Service



