Hi,
The registry never needs cleaning. It's very small and doesn't take up much space on the system. And changes to registry entries should be limited to the programs that created those entries in the first place, otherwise bad things can happen. So using a "registry cleaner" is far more dangerous than just leaving the registry alone.
+1
Suffice peruse tech forums .. for read how many had boot problems after a "registry cleaning"
When you have a problem with the registry base .. you will know immediately ... when you boot your PC
Usually the error message is explicit
If you want
absolutely use a reg cleaner .. CCleaner is a good choice as it is not too much intrusive.
In an ideal world, maybe. But in real life when you upgrade things or uninstall things the upgrade or uninstall software might be crap in which case it can leave stuff behind in the registry which can stop other things working.
Can you give a (solid) example ?
Cleaning the registry for the first time has speeded up my 3 year old laptop - fact!
Placebo effect
How much 1/1000 sec you gained at boot ? as it's only there you can gain some 1/100 sec if your registry base was few MB's before cleaning .. LOL.