can someone pls hlp (1 Viewer)

[pop333]

i have the following ....iam running windows vista ...on a dell duel core ...pc
have 2 tv cards .and a sat card ..one is a kworld .and a freecom usb .......
but when i run mediaprotal..everything works but will not bring tv on ..
but if i run windows media center it works ...but want to get it to work in mediaportal ...it is saying uable to build a graph .......... can soomone pls hlp