SharePoint Central Admin Application Pool stops as soon as I browse it

I recently setup a Search Service Application on SharePoint 2010.

Earlier when I used to search on a site, I used to get error telling me that there was some issue connecting to the service. After checking on the internet I found that I had to setup a Search Service App. After doing that, I started getting an exception on doing the search. The solution to this I found was to reboot the machine.

But since the reboot, I am getting an HTTP 503, Service Unavailable error. The Central Admin service in Application Pool is stopped. When I start it and browse the site, It goes to stop state again.

Any help on this?