Purchased an IBM-refurbished T43 Thinkpad earlier this year. The Windows XP Professional operating system came pre-installed and worked well for several months. On Sunday, the system informed me it needed to be rebooted to finish an automated update install. Following that reboot, the Windows interface would not let me launch any applications from the desktop or the "All Programs" icons. There were a number of other odd operating system responses, and I decided to perform a non-destructive reinstallation of the operating system. I now have the OS up and running, however, when I go to the Microsoft website and try to perform a Windows update, I get error number: 0x8007043B on the update web page. Following the self help instructions I found that the Automatic Update and Background Intelligent Transfer services were not started. When I try to start the Automatic Updates service, I get error 1083. The BITS service starts without error. I ran the "sfc /scannow" application and that did not resolve the problem. I also am having problems with websites that require me to supply a security certificate to use.