my pc is messed up!!!

I had an error on my laptop and pc, which when i run "regedit" an error appears- "re-g-istry editting has been disabled by your administrator" and then my pc or laptop restart. Even when i try downloading something, my pc restarts (not all downloads), and even when i try to install some re-g-ist-ry fixing or cleaning program, my pc restarts, and even when i search for that error on google or yahoo, my pc restarts. and eve when an error message appears.

i type re-g--istry in that way because bif i post it with its normal spelling, my pc would restart.

So i re-installed the windows on both my laptop and pc,

and then there was no error, but when i started sharing files, the same error occured.

how can i fix thisssss!!!!! (i think its because of sharing)