Hello Betsyhavintrouble,

could you please be more specific, why do you think that computer without Microsoft Security Essentials will cause problems? As Microsoft Security Essentials is anti-virus protection as AVG, Norton, Nod32, etc. and running more protections together can cause slowdown, crashes and unexpected computer behavior.

See this note at Microsoft website - http://www.microsoft.com/security_essentials/HelpTopic.aspx?mkt=en-us&assetId=4cae1455-6ead-493c-b5d8-7c88f39c0656#mainNav

Thank you