What version of IE are you using? Can you connect online with another browser like Firefox but not with IE? Are you getting any error messages that would help us to diagnose the cause? Does internet explorer start and open a window, but report that you cannot connect?
Please see this troubleshooter for IE
issues, though you will have to access it from another internet connected computer. This article
may also prove helpful.
You could try resetting the IE to default settings by going to Tools>Internet OPtions>Advanced and reset IE settings to default. That will often clear up a configuration issue. Here
are instructions to do so.
These issues could be related instead to your security software or a malware issue with your system. I recommend you follow this malware removal guide
if you suspect the latter. There are some infections prevalent that will block your internet access to certain sites, and must be removed before IE will work correctly again.
Without more specific information about your problem, I'm afraid that's the best advise I can offer you. I hope something there helps.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!