There really isn't much information to work with, but since you're having connection issues with IE and Limewire, that could point to network problems. You can download Firefox for free from http://www.mozilla.com/en-US/firefox/. Give it a try and if that gives you problems too, then it's either a virus/adware/spyware issue, or else you have network issues.
If you want to check the spyware/adware problem anyway, download and install SuperAntiSpyware and Spybot S&D. Then update and run both scans and remove anything they find. Adware/spyware can cause all kinds of problems, and sometimes even what you're seeing on your computer. You can find them with a search engine pretty easily
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