Hello every one i got this big problem that is really stressing me to the limit, i go to play RSV2 on Steam and once i get in the game on story mode it is laggy as hell and when i move the cursor in the menu its like its slow motion! HELP please!

Your computer probly blows.

i'm going to agree that your computer needs some upgrades. or maybe it's an end user error

Without seeing your system specs. there is no way of knowing where the problem might be!!

If you have a low end system, try lowering resolution .. set antialiasing to none and play with other settings until you find something that helps.

Also disable all programs that startup when you turn on your computer.
(Nothing running in the background)