Dell has returned a Windows XP option to some of its home systems but is now charging as much as $150 for the privilege. The company's Inspiron 1525 notebooks and Inspiron 530 regular and slimline desktops now all have an option to configure a system with Windows XP that uses a surcharge to take advantage of Microsoft's "downgrade" loophole intended for business PCs. Dell gives users a pre-insta
