used Microsoft Security Essentials to remove but cannot now change desktop in Display Properties1 person needs an answerI do too

That's probably because not all malicious files or entries were removed. Run a system scan with MalwareBytes anti-malware. More information here: http://www.bleepingcomputer.com/virus-removal/remove-internet-security-2010 and here: http://deletemalware.blogspot.com/2010/01/remove-internet-security-2010-virus.html