Trying to share mobile connection to xbox, error 0x80004005

I'm so tired of this error that I could I throw my computer down the window. So the thing is I'm trying to share my mobile connection from my computer to my xbox (which has worked before without any problems) but now when I click on properties on my mobile connection on the share tab to check the "allow sharing" box this error: 0x80004005 along with "undefined error" comes up.

Which seems unsolvable, think I've turned google inside out trying to find an solution. I've only found guys that got the exact same problem, but doesn't get any helping answers.

Sorry for my English, computer terms are a bit tricky to translate from Swedish.

P.S to avoid any unnecessary discussion about how I could want to share mobile connection to the xbox when it's only going to lag, it will not, it works like a dream when it chooses to work..

Best regards

Check your connection box/modem, restart it, see if that works, if not, then check your xbox connection and your phone connection. If it still dosen't work, then i would consider asking a professional