2. I believe the laptop has a mobility 5650? It's a bit hard to find detailed info on what appears to be a 7-8 year old laptop.
If it has a 5650, it's a substantial improvement over the Intel 4400, yes. Older titles should be no problem, and *some* newer titles on low/the lowest settings.
Are you locked into BIOS with a password? Unfortunately Toms has a strict rule against assisting with password circumvention as we cannot determine ownership. If it's something else, elaborate and perhaps we can help, but we cannot assist with circumventing passwords or similar security.