Internet Explorer has many problems, not least its recently exposed security flaw.

A better browser is the free Mozilla Firefox. I can't put it any better than Mozilla's own words:

"The safer, faster, better web browser featuring tabbed browsing, integrated search and live bookmarks.

Stop pop-ups, spyware and viruses. Get Firefox and spread the word!

I suggest dumping Microsoft's Internet Explorer"

Mac or PC - this is the best browser to have.