Geek speak

[altafass]

My computer is running really slow lately and I'm trying to get rid of unnecessary crap. I have a ton of files in my C drive file (20+ gigs) and I want to make sure that I don't delete any necessary files. Does anyone know what the following file types are and if they are safe to remove?

s3cg.#x
s3dk.#
s3f4
s3ig.#
s32s.#x

Any information would be greatly appreciated. Thanks!