Photoshop cs2 help ....?

hey my brother sent me a photo shop download from MSN.. and it's a exe folder and it's called "photoshop cs2 v9.0 +keygen.rar and inside there is 2 folders called "..." and "photoshop cs2" and a note pad called "install notes.txt" and a another thing that says "photoshop cs2.keygen.exe" ...so what do i click and how do i install it ? HELP ! thanks