Dont TOUCH a registry cleaner, they are bogus CRAPWARE.

Don't reinstall every year either, especially a server, my goodness you people are full o junk advice.

I have servers, running windows, that have been up 5+ YEARS without a reboot even, properly secured and networked off, even updates are done with very few exceptions, they don't need a reboot even if they claim to need it, they just need to overwrite in use files which can be done manually with service stop/starts.

Anyone reinstalling every year is probably installing a lot of junk like registry cleaners and freeware/shareware apps and not really doing it right. If you want to play around with junky software, make a special computer or virtualbox to do it and test to see what it does before you install it on your main machine.

It is just like on an iphone, linux, Mac, driod, or anything else with user install, install crappy software have a crappy running device!