Just updated to IE 7.0 - is it missing a month of sundays, or what?

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I took the plunge and updated to IE 7.0. But as usual, problems, problems. I can't open more than one window at a time. I click IE icon to open another window, and it does, but then from there is stalls - status bar moving VERY slowly and I have gotten more "sites not accepting" or whatever the problem is today that I did all year! Maybe due to the change of the new year date and all, but still, I used to be able to have 4-5 windows open at the same time nad work them all together. Now, with 7.0 being the only change I have made, is that my problem? Can you no longer do that with IE7? I see a thing called "Tabs" on the main screen, is that where I'd open another window? My speed has dropped alot - so slow today - but again, I'll give it to the change of the year and see how it goes tomorrow, but does anyone have any suggestions, incase that isn't what the problem is? Good thing I did a restore point. I can always go back but would prefer to stay current if possible! Thanks for any helps!