Done that. No luck :(

Everything is updated, the game and the drivers...

Yes. Lowest settings.

Gta V ::::

I don't know what it is, stuttering, frame lag...

Please have a look at the video I made of what happens:

My specs are:

Processor: intel core i7 3630qm cpu @2.40ghz

Graphics: nvidia geforce gt 630m 2 GB

memory: 8 GB

os: windows 8.1 64bit