i am a little worried in our neighbourhood shop i have seen kaspersky internet security 2009 and also in the internet i have sen kaspersky internet security 2010 released, so i am concerned what to do.

You should use an antivirus program and antispyware software, because your computer is now infected with viruses and/or spyware.
Here you have more information on computer security,
as well as good and free programs that you can download into your computer:http://top5antispywarereviews.com

Which one is the best and which one slows down the pc the most?

getting free keys for kaspersky in possible on internet, but some key files contain virus or other malware which may harm the system instead of protecting it. also those keys work for some days only and after that they get blacklisted and you cant use the antivirus features fully. updates get disabled and few options get blocked. instead of this get original antivirus from any good computer shop which you’ll get for 500-650 which is the better choice.
=====SM=====

Okay I do not know how, but I was playing this game and then it says something was detected then it was denied. However once I scanned Kaspersky, I says one threat detected in the virus column, is there any way for me to get rid of it? Because if not, I would be in heaps of trouble!

Which one do you suggest me to install and why?Also,should I install a stand alone firewall software also?If so,which one?