[secondmertg]

Did you do any of those or did you just dump Lion on top of your 10 year old train-wreck of an upgraded Mac OS X installation (Tiger -> Leopard -> Snow Leopard and now Lion) ?

If Apple only provide it as an App Store download to be installed inside the existing OS then they should make sure it can clean up after itself.

Yes, there are issues with certain applications and Lion but if you use it in a professional environment, you should always wait a few months when the smoke have cleared.

I didn't really have a choice on this laptop as it came installed with Lion.

Come to think of it, I doubt I'll be able to downgrade now as the snow leopard discs are for other macs