[Solved] Kaspersky slows down my computer. HELP!

After having my old Dell crashed from a virus Norton let through, I recently bought an HP and put Kaspersky Internet Security 2009 on it. It blocks almost everything, but I was hacked at one point. That problem was resolved, but I still am experiencing problems, unrelated to the hack. Kaspersky tries to block everything I do, and did before I was hacked. It doesn't like iTunes, or games, or the internet, and it frequently limits my activities on such programs. I like the increased protection, but I would prefer to be able to use iTunes and play games without Kaspersky slowing me down, which, by the way, it slows my internet to 1/5 the speed it has without the protection. It has also blocked me from downloading about half of the songs I purchase on iTunes.

Can anyone suggest an Antivirus software that has great protection but doesn't slow you down or block everyday operations? Any suggestions would be greatly appreciated.

I'm drinking to that right now.

I've switched to NOD32, it hardly uses any resources and has a good detection rate.

Not sure what you mean by installed correctly? I loved Kaspersky and was just humming along fine. about a month ago after an update whenever I try to open ANY program I get five minutes of the little K pumping and pumping before the program opens.