I've just tied to add points to my account with my PC and I find that I'm not allowed to do that or even access my account it seems...
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I'm pretty sure that the PC it shows me is my WORK computer, not my home computer. I don't think I've tried to buy anything for XBox Live on my work computer before, although I do check my hotmail from that computer.
How can I fix this and get back to using my account from home again?