I have been getting the following error very frequently over the past few weeks. The server is Windows 2003 R2 SP2 and IIS 6.0. The issue gets resolved on recycling the App Pool, but I need to find a permanant fix for this error asap. Failed to execute request because the App-Domain could not be created...

This happens in our Production Web server. Sometimes the processor usage spikes to 100% and doesn't come down. The server hangs and we need to force it by doing an IISreset. The process that takes all 100% is w3wp.exe. IIS logs for this period looks normal with regular traffic. This has happened...