How to reset my IIS services?

I’m using SBS4.5. About a week ago I started having problems with my IIS services(Socks Proxy, Default Website,Administration Website, Web Proxy and Winsock proxy). When I get connected to my ISP and begin to surf the web, the serices just stop. I go to the IIS console and restart them and 5 minutes later, they stop again. Well I’m having to restart these services all day long.

Has anyone had this problem? And if so, how do I fix it?