Extra fonts making windows slow

hi guys
last night my lil bro installed arround 5000 fonts, after that as he says and i noticed windows is kinda slow on loading certain application like IE or PhotoShop.
i think by removing thoes extra fonts which may have some corrupt fonts among them which could be the reason of latency i may be able to fix the problem.
now ive checked an artical on windows sites, it descrips how to restore the defualt fonts but the problem is that i cant find the Fonts entry on registry, its not there, and cant find a single search result of "Font" .
please help me.