when the problem first started occurring the launcher kept trying to update but got an error code 5 so after searching the internet for an answer i moved the temp launcher to the main directory and renamed it so it was an .exe extension instead of a .tmp. so i could now get into minecraft to play it but when i get into a world after of a minute of walking or flying around the game just crashes out making the whole thing unplayable i have tryed reinstalling minecraft to see if that helps but no joys.
i have been playing minecraft for several years using the computer i have currently got and while i know i should use a better computer to run it (sadly not an option due to lack in finances) i haven't really had a problem like this before

including 2 crash reports hoping it helps solve the problem