Go to Start menu and type in dxdiag, then when the program appears in the list press Enter to run it. On the second page you will find GPU info. Copy and paste here, or post a screenshot of it. This will help give folks a better idea of what your computer can run.

I was running a 2.3Ghz dual-core CPU with an old nVidia 8600 GS and emulating Castlevania: Order of Ecclesia or Portrait of Ruin would both slow down at times with NO$GBA 2.6. Also, Kingdom Hearts on PCSX2 would run fairly well with a little bit of slowdown in larger areas/fights. FFX-2 was pretty bad, though.