I'm running the official RC 7100 with some commercial and free software. Rock-stable!
The newer leaks should be even better. Not sure how you can improve "0" crashes, though
I assume over time anny driver conflicts will even be less likely if you have any.
Do not use registry cleaners... those will destroy any system. Many threads here too.
Ugh, I guess I should remove CCleaner.
ccleaner is perfectly fine for win7, its the only one that I trust.
Win7 is pretty stable in my experience.