Is my PC good enough? What configs are the "best"?

[dookiemon]

ive got an older notebook im using that USED to run dolphin fine for what i wanted to play, not so much anymore. i get some really bad speeds and fps, so if anyone can give me any tips, thatd be great.

Intel duo 2.1ghz
Nvidia geforece 8100m 128mb
4gb ram (max)

wanting to play twilight princess, fire emblem (gc and wii), mario galaxy (1&2)

thanks