The clean-up drive : How to rid your PC of viruses in seven steps

How to rid your PC of viruses in seven steps

OUR computers are a lot like our body, they also go down with virus attacks, and are often tormented by zombies and trojans. Not surprisingly, a bulk of the mail that I receive in reference to my article each Sunday is related to virus infections, malware, badware, bots and what-nots.

A lot of us techies will advice you to format your system, forget about your data, and start afresh. Others will genuinely want to help you out. But the truth is, it takes a lot of time to clean a virus mess. So this week, let me tell you how to do it.

Assumption 1: I am going to do this article around Windows XP, the most penetrated platform in India. It can also work with Vista, but not as successfully.
Assumption 2: You already have some kind of antivirus installed. In case you don’t, then we will install it, but you will need to skip steps 1 and 2.
Assumption 3: You have an antivirus software on a CD—not the pirated kind. If you don’t, ask a PC enthusiast to send you one, or maybe buy one of those computer magazines and use its CD.
Step1: Close all programs, except Windows.
Step2: Fire up whatever antivirus you have installed. If you don’t have any, skip to step 3. Go into antivirus settings and enable deep mode scanning—some antivirus scanners will warn you that this is slow, ignore the warning. Now, look for the action option—what to do if a virus is found. Change this to ‘quarantine’ (do not set it to delete, not yet). Run the scan. Shut off the monitor, just the monitor. Leave your PC alone for anywhere between one to three hours, depending on the size of your hard disk.
Step 3: Turn on the monitor. If it’s still scanning, leave the PC alone for some more time. But if it’s done, open up the quarantine report, and see how many files have been moved. These are the dangerous ones. If nothing comes out of this scan, well you are lucky.
Step 4: Shutdown your PC, and restart. When the PC is starting, press the F5 key to boot the PC in safe mode. Once in safe mode, it will give you a warning that some things will not work. Now go to Add/Remove Programs, and uninstall your antivirus; this is an important step. After you remove the antivirus, you need to restart your PC in safe mode, remember to keep the F5 key pressed.
Step 5: Once restarted, put in the antivirus CD—please don’t use a thumbdrive/pen drive for this—and install the antivirus, preferably one of the free ones like AVG Free, Bit Defender Free Edition, or CA Antivirus Free Edition. Once installed, run deep scan again. Since your PC is in safe mode, and most of the old files are already in quarantine, this will be faster than the last time.
Step 6: You will see some results, move all of them to quarantine, and then shutdown your PC. Reboot it in normal mode.
Step 7: In normal mode, connect to the Internet and update antivirus. Once updated, run a full scan again. Sometimes it will find more threats, but this is unlikely if you have used the latest CDs.
Done. Your PC is now clean. In case you still have some viruses, or are getting too many errors, you will either need to format the PC or get an expert to clean it for you. But if you do the above steps, scan your PC regularly, stay away from downloading unnecessary utilities and backup often, you will not lose much data.
Happy computing.
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The Above Article appeared in the Indian Express, on the 3rd August, 2008.