XSI 5 Hangs

Though I could be wrong I have tried number of things from reinstalling XSI SoftImage 5 to removing Comodo firewall, to disabling on access scanning. No matter what I do when CAV is up it appears as though XSI will not start it freezes during the initalization process. I wish I could give you more information on the subject, but I havn’t had any errors pop up to provide you with more information.