SBS hanging at Applying Computer Settings

Problems began a couple of days ago. Services such as WWW and Pop Connector and Exchange Routing Engine will not start. I used a batch file to start the www service but thats about it. I uninstalled IIS and reinstalled but to no avail. I am running SBS with SP2 and Exchange with SP2. I installed all the SBS server components and reinstalled Exchange but still no luck. Frustrated I ran dcpromo to get rid of AD and now I am having this applying computer settings problem. I have left the server like this but I dont think I can face another day like this tomorrow. Could it be the NIC adapter? Someone please help.

Regards

Debbie