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

Any new software that I try to download gives me an error reading, "The Windows Installer could not be accessed, this can occur if you are running Windows in safe mode. Contact your service provider". Please help! I am trying to upgrade my iTunes software so I can sync my iPod to my computer but Windows Installer is preventing this for now. Thanks.

it has lots of virus, spyware lots of junk
please list softwares I can use to fix my windows vista, & make it run faster. it is running very slow.
thank you

Are they actually effective/necessary? I've never used one, and wonder if it's all hype.