Wuauclt.exe Pop-Up Error Message After Selecting A User?

Upon start-up, and after selecting a user..usually Christine, my wife [there are 4 users set-up] at the desktop screen I immediately get a pop-up error box that reads WUAUCLT.exe encountered an error and needs to close. It also goes on to read...if you want to send this message to Microsoft click this and then, of course, there is the Don't Send option as well. I usually click the don't send option....10 seconds later the box pops back up...I went to Task Mgr a few times and saw it [wuauclt.exe] running in Processes and was able to stop it from running. However, it is not always in Task Mgr to stop!