How well do laptop capture cards work?

My laptop is a:

Compaq Presario CQ57-229WM

2048MB of RAM

AMD C-50 Processor (2 CPU's) 1.00 GHz

64-Bit operating system, has Windows 7 (32 and 64-Bit)

AMD Radeon HD 6250 Graphics Card

Realtek high definition audio sound card

what's the best capture card for me?