Watch out for the Malware “Security Shield” – I’ve fixed 2 PC’s with this already, whatever you do do not click on it as it will take you to a site demanding $79. Fortunately there’s a fix which you can download usually from your Anti-virus supplier or search the net. Be aware though you’ll have other viruses/trojans that need fixing.
‘My Security Shield’
This site offers a more comprehensive guide to identification and removal of this Anti-spyware app ‘My Security Shield’ which changes periodically in design but the removal is essentially the same at bleepingcomputer.com. I also recommend the use of Malwarebytes a Malware removal App which can be found for free download at download.com