If your PC is protected with proper Antivirus/firewall then it is safe to an extent depending upon your awareness, but their are things you should know for the safe browsing. It is valid for all the things you do on the net. Google "Safe browsing tips". This would be good for you to know about it, not just for netbanking but other things as well.
Avoid net-banking from public cafes/computers.
Net banking is not safe at all. But if you get a situation to do net banking then never do transaction online in any internet centres. there may be a possibility of hacking your bank details and robing your money
Manas, I just replied to a similar thread also raised by you and now I realize you raised it at the same time! I am locking this thread now and expect that this is not repeated!