Antivirus for Mandrake 9.0
 

I do not see any antivirus software in my linux,
where to get a free antivirus and install it?

normally i use Norton antivirus for windows, is it available for linux too?

Because linux is more secure, there is "less" need for antivirus software. But there is some software out there, forgot what it was called.

just dont run every program as root :D

Rather than needing anti-virus software, on Linux you keep current on security updates, run a firewall, and don't run as root by default.

The weirdest part about Linux antivirus software is that many companies have strict policies that require antivirus software be intalled on any PC in the organization. Obviously policies like this are based on the fact that most workstations are running some form of MS Windows, but many are applying it to any workstation regardless of the operating system.

As a rule Linux/*NIX systems are more resistant to virus infections for various reasons, such as

1. User/permission system limits the scope of what a virus can 'attack'
2. It's more difficult to write a virus for *NIX as there are so many different environments to program for (ie: Kernel version, compliers/linkers, available programs to infect, device priveleges, etc...)
3. The limited install base makes it more difficult to propagate (especially considering the diversity as stated in #2)

<edit> Oh yeah... as for the actual question, I think there's a package called "kaspersky antivirus" but I've never used it myself. And yes, there are probably others but a little Googling would be all you need to find it.

Linux is secure, but it is more popular, so running a tiny antivirus program won't harm.
Try http://www.antivir.de/. It's free for private use.

Can you explain why linux is not vulnarable to virus ?
what makes it different from windoze ?

Well basically as mentioned, the user and permission system of Linux means vital OS files are usually owned by the root account and access is denied to other users. This means that if someone randomly executes a hypothetical Linux virus they get emailed, which would assume the current user's permissions, it could not affect vital OS files.

Also the fact that there are so many different things you could or could not have installed on you Linux pc means it's harder to target the OS, or to even write working code.

There are a lot more complex things (exploits to elevate code's permissions to those of root's, virii writers not 'crapping in their own back yard', etc) but that's a start. :)

clam antivirus specially for unix:
http://freshmeat.net/projects/clamav/?topic_id=861

The basic reason why Linux is safer is that there are no viruses for Linux in the wild (yet).They do exist though.
There are a lot of commercial programs that are also available for Linux - I think almost all of them.