Security threats have become so common and come in through so many avenues that you never know where will they stike next. So the usual precautions are to install anti-virus software and firewall on your PC.
By and large, these are sufficient to block most threats. However, malware writers can also write code to
bypass the anti virus and execute it from the physical memory itself. So you need to do something more. If you are a Win XP user, there is a tool you can use that comes with Win XP SP2, known as DEP.
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DEP (Data Execution Prevention) is a method that prevents the system from executing contents in the 'data' areas of RAM. This also eliminates many situations where the system would otherwise have crashed. By default, the feature is enabled in systems with SP2 installed. We need to fine tune it. In this article, we see how to do that. Make sure you have SP2
installed on your PC.
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Sanjay Majumder