Q: itunes cannot connect to itunes store

i tried to install and uninstall several times and it still wont work

tried to uninstall all the apple softwares and redownload the itunes.. still won't work

i can access itune store on my ipad. but when its on the computer, it just keeps on popping up messages saying:

`itunes could not connect to the itunes store. An unknown error occurred (0x80090318)

make sure your network connection is active and try again .. `

what do i do ???????