unable to download Windows 10

Hi Everyone,
I have Windows 7 and I reserved a copy of windows 10 with the icon in my task bar from Microsoft, at the time it checked my computer very briefly and said my computer could download Windows 10. this morning I received a notice saying I was ready to download Windows 10 but I want to wait to get my friend to check my computer first. I clicked the X and closed it then I iopened it again as I thought there may be somewhere I could put a date to download but a dialogue box appeared saying my computer was not compatible with windows 10, something about NVIDIA GeForce 6150SE nForce 430. Does anone know what I can do?. I can't understand Microsfot saying I could download today and I suppose if I had accepted I may have it now. What to do?
Regards,
Joan.

If it is not compatible, then you can't upgrade. Simply, the hardware might be better off with Windows 7.

Check this, however. It might help to get a workaround sometimes.