w2k = windows 2000, obávam sa, že skype nepobeží na tak starom OS:

Skype for Windows desktop

PC running Windows® XP, Vista or 7, both 32- and 64-bit operating systems.
Internet connection – broadband is best (GPRS is not supported for voice calls).
Speakers and microphone – built-in or separate.
For voice calls we recommend a broadband connection with 100 kbps down / 100 kbps up.
For group video calling everyone on the call needs Skype 5.0 for Windows or Mac or higher plus webcams, and at least one person needs a group video calling subscription. For best quality we recommend you use a high-speed broadband connection of 4Mbps down / 512kbps up and a computer with a Core 2 Duo 1.8 GHz processor. As a minimum you’ll need a high-speed broad connection of 512kbps down / 128kbps up and a computer with a 1 GHz processor.