security tool warning

I have opened an email from us postal service and it has added an anti virus tester which i have to pay for can anyone advise me how to get rid of this as it has blocked my system?
Answer #1
try to uninstall anti virus tester !
Answer #2
it wont let me
Answer #3
try these http://download.bleepingcomputer.com/grinler/rkill.com
http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?part=dl-10804572&subj=dl&tag=button
check ur pm also !
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