I am using a Dell Inspiron 5150 and it had XP on it but I upgraded to Windows 7 Ultimate and since I have done that my laptop will not charge. However it does charge when it is completely off and I plug it into the AC but as soon as I turn it on it changes back to not charging. I have tried all of the "Take out the battery and unplug AC blah blah blah" that I could find and they don't seem work (unless I didn't do them right). I have got the latest bios and everything. would re-installing windows 7 possibly fix it? or is their another way? Thanks for any help!