I use Advanced System Care free from Iobit and let it do its Deepclean option. Version 5.2 now.
it solves lots of problems with any Windows verson.

I run it regulary on all my machines, Windows7 and XP, 64 and 32 bit.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!