Below are the switches you can run along with wuauclt. Example: wuauclt /detectnow
Most of these options don’t give any noticable response, but that may be because of the state of the service.
The command ‘wuauclt /ResetAuthorization /DetectNow’ worked for me right away.
a nice alternative which i tried is WuInstall ( http://wuinstall.com )
in the free version you can search for certian updates (for example critical ones), download and install them.
Just looked up wuinstall, very awesome, thanks for the tip.