Netzero not responding

My Dell computer is three months old. I have installed Netzero 3G. The

problem started when typing my e-mail the keyboard was very sluggish and IE

was not responding when I closed it. Netzero also would not close. I

restored the computer to a point before the problem and reinstalled Netzero.

Now IE closes without a problem, the keyboard is still sluggish and Netzero

is still not responding when I close it.

I'm open to any suggestions. Thanks.

Janet