Skype kan ikke startes

http://www.skype.com/help/guides/firewall.html

Skype and Firewalls
Some Skype users might experience problems connecting to Skype network due to installed firewall on their computer (Skype error #1102). Skype should work with any firewall and router hardware/software.

Skype needs unrestricted outgoing TCP connections to some TCP ports. If you fail to connect to Skype network, it is likely that your firewall is blocking these and you need to open up some outgoing TCP connections. Note that this is about outgoing connections, not incoming connections. In most firewalls, you have to specify a destination port or port range to open. There are four options for Skype to work:

Ideally, outgoing TCP connections to all ports (1..65535) should be opened. This option results in Skype working most reliably. This is only necessary for your Skype to be able to connect to the Skype network and will not make your network any less secure.
If the above is not possible, open up outgoing TCP connections to port 443. This will only work if you are using Skype version 0.97 or later.
If the above is not possible, open up outgoing TCP connections to port 80. Some firewalls restrict traffic to port 80 to HTTP protocol, and in this case Skype can not use it since Skype does not use HTTP. In some firewalls it is possible to open up all traffic to port 80, not just HTTP, and in this case Skype will work.
If the above is not possible, Skype versions 0.97 or later can use a HTTPS/SSL proxy. In order to do that, you have to configure the proxy address in Internet Explorer options. Then Skype will be able to use it as well.
Please use our problem reporting form to report in details all the instances when you have experienced a problem with Skype and a firewall.
Learn how to set major firewalls to allow Skype to run:

Windows XP SP2 Firewall
Norton Personal Firewall
Zone Alarm Pro
Mcafee Firewall Pro
You need to have Macromedia Flash Player installed to watch these tutorials.

skulle være et svar.

tak for det, den hade jeg ikke regnet ud. ;)