I'm new to this and can someone please help me as i can't install oddworld stranger's wrath hd onto my computer .
There's 2 files . I'm sure i have to install number 1 first but how .

Two files? Hmmm.... normally you should have an installer file (setup_gamename...) And that let's you install the game. If you do not have that file you should probably check if your download worked correctly.
Ah yes, I am assuming you are talking about the windows version? If you are talking about another one I have no idea what it should be like :D

Maybe one of the intinite bugs present in this game, I had a lot of issues with it, thei I gave up on playing it.

You need both files to install the game, but you only need to run the first one. The files are:

setup_oddworld_strangers_wrath_hd_2.1.0.12
setup_oddworld_strangers_wrath_hd_2.1.0.12.bin

Run the first file, follow the on-screen instructions and after a while the game will be installed and you'll be able to play it. Please specify if you want me to be clearer.