Soo, buying new memory is the way forwards. If you did manage to disable that video memory you'd probably end up with a blank screen, extremely useful that
[/irony]
A 1Gig-memory lies somewhere ~25$ nowadays.
(I actually did a fairly recent memory upgrade on my laptop, what you should be prepared for is that two different memories might not work together.)
Everything subject to if you really do need more memory of course (check how much is used/available in the task manager under Performance--physical memory).
- Arand