Open notepad and paste this:
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
Save it as eicar.com.
Your Anti-virus will then either not let you save it of when you have saved it will remove it for you.
Don???t worry about it. European Institute for Computer Anti-virus Research (EICAR) have got people to program Anti-Virus to recognise this as a threat (even tough it???s completely harmless
Subject: test ur antivirus 
Fri Feb 03, 2012 2:31 am
