Usbser.sys – Pre Service Pack 3 Revision History for Windows Vista SP2, Windows Server 2008 SP2 and Windows Small Business Server 2008 (SBS 2008)
17-Nov-2009 – 6.0.6002.22269 – Usbser.sys – x86/x64 – http://support.microsoft.com/kb/925681 – When you try to download a file from the Internet by using Internet Explorer, the download stops responding