Since installing SP2, admittedly only yesterday, I have noticed that my computer takes about twice as long to start up or reboot.  Has anyone else who has SP2 noticed this?

Simon, Little tip I picked up the other day  

Go to Start/control panel/My folders/View/ and untick the box which says: Automatically search for network folders and printers.


It speeds it up a bit  

Sean, have any of the PCs you've installed SP2 on had Norton AV?  I'm starting to wonder if the start up is being slowed down by the Security Centre trying to verify Norton AV?  At the moment, it can't, until NAV issue an update.  

Your theory sounds plausible Simon, although SP2 detects McAfee and AVG without problems, so why should Norton be different? (LOL)

Don't know why Norton should be different, but this is what they say:-

Q:     Why does the Windows Security Center say that the status of my Norton security product is "unknown."

A:    Your Norton security products contain tamper protection features that prevent malicious code from determining their status. This tamper protection also prevents the Windows Security Center from determining the status of your Norton security products. Shortly after Microsoft releases Service Pack 2, Symantec will make a correction available through LiveUpdate. This correction will allow the Windows Security Center to correctly identify the status of your Norton security products.

They go on to say that the uppdate will be available through Live Update in 'the coming weeks'.