I have 3 computers at home sharing a broadband connection. On 2 of them Internet works perfect. But on 1 computer, Internet Explorer is really slow, like a 14.4 modem and I cant login to MSN messenger. Firefox, Miranda and Skype works as it should. I have runned 3 different Anti-virus/Spyware checks without any results. Anyone?

Marcus, sounds like the work of a nasty to me. Trojan? Be aware that a virus and a trojan are similar, but not the same. Many times, a virus scanner can detect one it can't clean , other times, it gets missed entirely. There’s an online trojan scanner @: http://www.trojanscan.com/trojanscan If it turns out that you have one and need to clean, A² can do the job and you can get it free @: http://www.majorgeeks.com/download4281.html among other places. If it turns out that you need to use it, be sure to update prior to running. Another 'maybe' is stuff running in the background (not necessarily nasties). If you have lottsa things running, the net effect can be a rather severe slowdown while everything gets attended. HTH. Ed in Texas.

Thanks for the help Ed, did as you said but it didn't work. Maybe its some kind of 'hijacking'? A² only searched for malware