Los "sintomas" (en ambos juegos) es que una vez sale todo el rollo de las marcas, presentación etc y entra al menú principal del juego el juego se ralentiza de una forma exagerada para lograr pulsar el boton de salir del juego me cuesta bastante ya que hago un movimiento con el ratón y el juego reacciona a los 10 segundos (al final lo hago por ctrl+tab y cerrar xD).
He hecho la prueba de "Canyourunit" http://www.systemrequirementslab.com con el mass effects y me sale "Aprobado" en todo lo recomendado, os pego aquí lo que me ha salido:
Cita:
He actualizado los drivers de la targeta grafica y los de la BIOS y sigue la cosa igual. Directx llevo la ultima versión (permitida para XP) la 9.0c. Y ya no se que pensar que puede ser..CPU
Recommended: 2.6+ GHz Intel or 2.4+ GHz AMD
You Have: 2 processors running - AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
CPU Speed
Recommended: 2.6+ GHz Intel or 2.4+ GHz AMD
You Have: 2.00 GHz Performance Rated at 5.70 GHz
System RAM
Recommended: 2 GB
You Have: 3.0 GB
Operating System
Recommended: Windows XP / Vista
You Have: Microsoft Windows XP Professional (Build Service Pack 22600)
Video Card
Recommended: ATI X1800 XL series or higher, NVIDIA GeForce 7900 GTX or higher
You Have: NVIDIA GeForce 8800 GT (GeForce 8800 GT)
Video Card Features - Minimum attributes of your Video Card
Video Card 3D Acceleration: Required - Yes , You have - Yes
Video HW Transform & Lighting: Required - Yes , You have - Yes
Vertex Shader Ver.: Required - 3.0 , You have - 3.0
Pixel Shader Ver.: Required - 3.0 , You have - 3.0
Video Card Driver Version (DirectX)
Your driver version number is: 6.14.11.7519
FYI: Your video card driver version is provided for your information, but it is not part of this analysis. But proper video card driver versions are important to the proper operation of your product.
DirectX Version
Recommended: 9.0c
You Have: 9.0c
Sound Card
Recommended: Yes
You Have: Realtek HD Audio output
Sound Card Driver Version
Your driver version number is: 5.10
FYI: Your sound card driver version is provided for your information, but it is not part of this analysis. But proper sound card driver versions are important to the proper operation of your product.
Free Disk Space
Recommended: 12 GB
You Have: 126.3 GB
Recommended: 2.6+ GHz Intel or 2.4+ GHz AMD
You Have: 2 processors running - AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
CPU Speed
Recommended: 2.6+ GHz Intel or 2.4+ GHz AMD
You Have: 2.00 GHz Performance Rated at 5.70 GHz
System RAM
Recommended: 2 GB
You Have: 3.0 GB
Operating System
Recommended: Windows XP / Vista
You Have: Microsoft Windows XP Professional (Build Service Pack 22600)
Video Card
Recommended: ATI X1800 XL series or higher, NVIDIA GeForce 7900 GTX or higher
You Have: NVIDIA GeForce 8800 GT (GeForce 8800 GT)
Video Card Features - Minimum attributes of your Video Card
Video Card 3D Acceleration: Required - Yes , You have - Yes
Video HW Transform & Lighting: Required - Yes , You have - Yes
Vertex Shader Ver.: Required - 3.0 , You have - 3.0
Pixel Shader Ver.: Required - 3.0 , You have - 3.0
Video Card Driver Version (DirectX)
Your driver version number is: 6.14.11.7519
FYI: Your video card driver version is provided for your information, but it is not part of this analysis. But proper video card driver versions are important to the proper operation of your product.
DirectX Version
Recommended: 9.0c
You Have: 9.0c
Sound Card
Recommended: Yes
You Have: Realtek HD Audio output
Sound Card Driver Version
Your driver version number is: 5.10
FYI: Your sound card driver version is provided for your information, but it is not part of this analysis. But proper sound card driver versions are important to the proper operation of your product.
Free Disk Space
Recommended: 12 GB
You Have: 126.3 GB

Bueno espero haber explicado todo bien ;) muchas gracias.