Shawn, I forgot to do what you suggested regarding the modem. But this afternoon, all of my problems magically disappeared on Firefox. I still had the certificate issue on IE, but since I rarely use IE I don't care very much.
Any ideas as to why the problems would disappear? Do you think that the problem may have been with my ISP, TimeWarner Cable?
Sounds great, Dave! I am on Newegg's mailing list. Do you think that they would be a source of good deals for a unit? Most of their specials are for parts.