Im using my work PC running windows XP, i purchased easytether pro before they took it off the market, and when i go to the market, then my apps under settings. You can still see easytether pro, it won't download it through the market if your using 3G, but if you connect to Wifi it will download. I have also had success the putting a copy of the .apk on the root of my sd card and installing it from there. You can find the .apk for that floating around on the web if you look, but i was just using it at lunch and it worked fine.