SQL 2005 running slow - AWE memory?

We have a SQL database that seems to be gradually getting worse - I've done the usual things - profiling index etc looking at the memory it appears to stay at 1.6GB and this may (?) be the problem. The server has 8GB has /PAE set in the boot options.

However when I try to tick Enable AWE memory in server properties I get a failure with "Requires lock memory permissions".

1. Can this be done on the fly or do I need to get users out?
2. If it can be done - how do I do it?
3. Any other potential area's to look at on the server config?

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1. No, you need to restart SQL Server service
2. http://msdn2.microsoft.com/en-us/library/ms190730.aspx
3. /3GB and /PAE switch in boot.ini, AWE enabled in SQL Server instance, server max memory set to 7500 (with 500MB left to OS)

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The LOCK PAGE IN MEMORY permission must be granted to the SQL Server account before enabling AWE. For more information, see How to: Enable the Lock Pages in Memory Option (Windows).
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Microsoft SQL Server 2005

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