deleted file but some still on pc cant find them but know they r there

I scaned my computers registry from a registry cleaner, but I m in doubt that is it really cleaning the invalid registryies or not. I think that it is not compeletly scanning all registry entries. One more think I create a invalid registry in "regeditor" but it is not showing me that invalid registry. So how i can chk abt this "is my registry cleaner is working fine or not"

Also why is windows xp not a safe environment? i heard that on Beauty and the Geek…..

I'm still on Windows ME, I have a Kernel32 error coming up and have been told to use a registry cleaner.
Thanks.

I need to service 3 XP Pro machines. I need to clean the registry, compress the content and update drivers without too much hassle.

Used to use acutils but this no longer seems to work and need a reliable, high quality registry cleaner with lots of options.

Free would be nice of course but a modest payment is ok too.

Cheers