It's the second Tuesday of the month so if you're running Windows you can expect your monthly dose of Patch Tuesday updates today. For October there are a total of nine bulletins, three are rated as critical, one is marked as moderate and the five other updates are described as important.
The critical updates affect a vulnerability in Internet Explorer and Windows itself, all three affect Windows 8.x plus one important update. For Windows 7 there are three critical updates, one moderate update and one important update. There's also a patch for Office as well as one for Developer Tools.