Fujitsu Lifebook A530 problem

Greetings everyone! I have a Fujitsu Lifebook A530 with the following configuration :

CPU Type Intel Celeron
CPU Number P4600
CPU Speed 2 GHz
Internal Memory 2048 MB
Memory Slots (Total / Free) 2 / 0
Memory Type DDR3 SDRAM
Hard Drive Type HDD
Hard Drive Size 250 GB
Sound Card High Definition Audio
Audio Connections Line In /Line Out /Mic In
Battery Type Lithium Ion 6-Cell
Battery Time 6 hrs
Screen Type TFT LED
Screen Size 15.6 in
Screen Resolution 1366x768
Display Surface N/A
Touch Screen No
Operating System Windows 7 Professional
Optical Drive DVD-RW / -RAM / CD-RW
Dual Layer Yes
Graphics Card Intel HD Graphic
Graphic Card Memory Size N/A
Multiple GPU No

I installed some games on it (old games mostly) and they don't run well. I am talking about things like Warcraft 3 or Heroes of Might and Magic 3 (GOG version) and I can't play them well because i keep getting freezes during gameplay. All drivers are installed and everything else works just fine on the laptop (HD movies, internet browsing, etc).

Any ideas on what am I missing over here?