Windows XP is proving one tough bugger to kill. Perhaps that's because the majority using it have no intention of upgrading their ancient rigs, so it's simply easier to roll the dice. For the rest of you, if you're building a new PC, Windows 8.1 is better than it's ever been and continues to improve with each new update. Want to give it a spin? Now's a good time -- today's top deal is for Windows 8.1 64-bit for $85 with free shipping (normally $100 - use coupon code: [EMCPEPW22]). Unlike XP (RIP, old friend), Windows 8.1 is supported with monthly security updates.