Can any body help me in WRITING an ANTI virus source code ??Well basically a traditional antivirus engine does nothing more than comparing file signatures against signatures of known viruses. (In real LIFE it's more complex than that, but this is the basic idea.)
So in order to create an anti virus program you will need signatures of the viruses it should be able to detect.

But maybe you should get the basics down first. Like what programing language are you going to use to write the program? What operating system should it run under? What viruses should it detect and so on... Also what programming experience do you have? Because a project like this is not for beginners.
I am a final year Comp Science Student . I am fully determined to design an anti-virus engine . The OS is Windows . Language can be C++ or most probably Java .Maybe you should take a look at an open source antivirus program then.
http://www.clamwin.com/

It is written in C++ and Python.How can I get source code or even documentation . I went to the site but I am not able to get it ! Please help You will have to CHECK it out from their SVN repository (source control) here.
http://sourceforge.net/svn/?group_id=105508how to retrieve the source code from the CVS or give some idea how to contribute to the source code ??
thanks for your help How to retrieve it is described on the page I linked to. Note that is not a CVS repository but a SVN repository. You will need a SVN client in order to do the checkout.
TortoiseSVN is a good standalone SVN client. if you're using MS Visual Studio you might WANT to take a look at AnkhSVN.

If you want to contribute to the source code you will need to contact the developers of Clamwin. I highly doubt they let anonymous people commit to the repository since that could seriously mess up the code. In that link there are options for retrieving the exe file not the source code .. I can see the codes but I cant download them all at once .. please help me in getting the code .. Have you downloaded a SVN client yet? If yes which one?I have downloaded TortoiseSVN and ankhsvn .. these are msi files .. will try to work out I have installed TortoiseSVN .. its telling to right click and create repository .. How to get the codes from net .. What URL to give ?? Please help ..This is the url for the repository.
https://clamwin.svn.sourceforge.net/svnroot/clamwin

It is listed on the page I linked to earlier.
http://sourceforge.net/svn/?group_id=105508I tried to work out in linux ..
svnadmin create /usr/svn/newrepos
svn checkout "https://clamwin.svn.sourceforge.net/svnroot/clamwin/"
I tried the above but it gave error as below ..
svn: PROPFIND request failed on '/svnroot/clamwin'
svn: PROPFIND of '/svnroot/clamwin': Could not resolve hostname `clamwin.svn.sou rceforge.net': Temporary failure in name resolution (https://clamwin.svn.sourcef orge.net)

How to resolve please help ..What?
In your last post you have downloaded TortoiseSVN and needed help getting it to download the repository... now you're suddenly doing it in Linux? Sorry can't help you there. I'm only a Linux beginner myself.