Usually you set the shared memory in the BIOS. You have 2 issues. your CPU was designed for low power use, not high performance and you have a on-board graphics card. I can't find info on that laptop, looks to be outside of US, but from the specs it looks to be either an ultraportable or a netbook.
You won't be able to coax good video performance out of that thing. Should play DVD movies OK, but I doubt anything high-def will work.