Microsoft have today released Service Pack 1 for Windows 7.
This is a mixture of all previous updates and bug fixes together with some new ones.
I will be testing the update this week to see if it has any impact on Photoshop/Lightroom/Exiftool etc use. If your PC is mission critical then you may wish to accept just normal updates and hold back on SP1 till I have tested here.
UPDATE:
Well its been a week now and there is nothing bad to report from my experiences of the SP1 update. I have noticed a few small improvements in responsiveness so I would suggest that if you run Windows 7 you give the service patch a go.
Stephen