My system is Vista SP 2. My updates have been failures since April 21, 2012. The Windows update screen shows the error codes as 641, 643 and 80070641. The Windows Update icon is continually on the taskbar. The shutdown icon continually has an icon within it to install the updates.
Additionally, can't install (update) or uninstall software from the control panel. Get message, "The Windows Installer could not be accessed. This can occur if the Windows Installer is not correctly installed. Contact your support personnel for assistance."
Any ideas on how to correct the problem?