can't take ownership, ect.

i'm currently customizing my windows 7 64 bit. i have already patched my uxtheme and have taken ownership of several system files in order to do what i need. then out of the blue i tried taking control of another file i needed to modify and when i click the ownership tab and click edit, the windows appears and closes instantly before anything is even displayed, and even a couple of the files i already have ownership of i can't rename or anything. like it'll let me and verify that i want to change the name ect. and i click enter and all that then nothing happens. i don't get it

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