Security Reads wrote:

MS10-020: SMB Client Update

Today Microsoft released MS10-020, which addresses several vulnerabilities in the Windows SMB client. This blog post provides additional details to help prioritize installation of the update, and understand the attack vectors and mitigations that apply.

The good news is that depending on how your Windows 7 install has been going, regardless of what you've told Windows Update to do it'll probably download this patch, install it, and reboot at 3am sharp whether you like it or not.

RE: Security Research & Defense : MS10-020: SMB Client Update