Windows upgrade fixes security flaws, but it's not perfect (USATODAY.com) USATODAY.com - Microsoft is making a major push to get home and business customers to embrace the security-focused overhaul to its Windows XP computer operating system. But while most consumers are advised to upgrade to Service Pack 2, there are a few things to keep in mind. Personal Tech columnist  Edward C. Baig  addresses questions on the free SP2 upgrade.