|@ riider, there are two warranty claims on PCs namely: Manufacturing and Point of purchase.|
Manufacturing Warranty: This is based on from the point of production date which can be checked online from PCs manufacturing site such as HP, DELL and many more.
Point of purchase: This is based on from whom your buy it from and date on invoice/receipt. NOTE: This is crucial when you wanted to buy a PC because you have to think of a product with after sale services, right vendor (usually authorised dealer) and time involved when support team are to fixed issues.
I would advised you tell us your PC warranty status in order to know where to help.