imnotcaz Please provide a dxdiag. Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.
Your sister may not have exactly the same hardware configuration as you, or you may have installed some app that she did not, or one of you disabled something that the other did not, or your computer could have had a problem with a Windows update, or... you get the idea. The point is, it's not only about the model but about the software installed on it, and whether it's installed properly.
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