Error despues de la instalacion de Service Pack 1 de vista

Después de instalar el service pack de Windows Vista, dejo de funcionar el IIS, revisando el visor de eventos encontré que el problema era originado por el servicio “WAS (Windows Process Activation Service)”, el cual no podía iniciar, para solucionar los problemas seguí los siguientes pasos recomendados por esta pagina y salió todo funcionando
Pasos:
II. Verify that configuration backups are being created
A. Make a token change in ApplicationHost.config.
1. Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
2. Type cd %Windir%\system32\inetsrv\config.
3. Type notepad ApplicationHost.config.
4. On the second line of the file, after the beginning comment mark , add some text such as "Configuration History Test". 5. Save the file and note the time of the change. Because you have added a comment to the configuration file, AppHostSvc will detect the change and make a backup, even though no change to configuration itself has been made.