McAfee Personal Firewall Plus Error Message

Can anyone help me? I have an inspiron laptop and as of yesterday I have received mcafee personal firewall plus error message that says: An unexpected error has occurred in "mpfTrayErrors.txt". What is this? How do I fix or get rid of the problem? It has a hold on my laptop and won't let go. Can not do anything internet/email even shut off my computer?

Would appreciate any help at all.

Thanks in advance!