EVERYTIME I TRY TO RENDER SOMTHING IT RUNS FOR A MINUTE OR SO SO THAN SAYS A ERROR OCCOURED (0x80010105) (MESSAGE MISSING)
I am using settings that used to work fine m2t and mtv files fail.
Just a general KB article about issues with rendering (not necessarily the crash), see this link.
If you search the KB, you may find more articles as well. In general I would try to reduce the project's complexity and try rendering...maybe drop it down to just one clip with no effects. If that doesn't work, maybe start a new project. If that doesn't work, then look for recent installs/uninstalls on the system (especially because you said this used to work).