I recently viewed an email and received some sort of virus. Only in the email address where I view in infected email and only when using Firefox do I have a problem. When using the email address I can no longer send emails, reply to emails or forward emails. I can no longer view You Tubes when using FirefoxI. I can send emails, reply, and forward emails and view You Tubes when using internet explorer. I do not have this problem when using another computer. I only have the problem described when using Firefox with the computer which was infected. I prefer Firefox so can you please guide me in a direction to address the problem.

Phil