If you could list some specifications it may help. How is your internet acess set up ? Do you have a modem and router or just the modem. What is your newtwork card brand and is it builtin to the motherboard or a seperate card? When was the last time you updated the drivers for the newtwork card/chip ?
Motherboard ,cpu ,ram , operating system ? Did you build it or buy it all built ?
Have you been getting onto the internet and just not updating Windows ?