Super Smash Bros Melee sometimes won't register my buttons?

[ihazkungfu]

Hi, so straight to the problem; as the title states, sometimes whenever I play SSBM, it won't register the buttons I'm pressing! (E.G: My jump button)

My laptop is a Sony VGN-SZ780E

Specs:
Windows 7 Ultimate 64-bit
Intel® Core™2 Duo CPU T8300 @ 2.40 GHz (2 CPU's), ~2.4GHz
4096MB RAM
NVIDIA GeForce 8400M GS (Yes, it's an integrated graphics card)
1838MB VRAM (According to DxDiag)

I'm running Lectrode's build R6970 x64 SSE41.

I'd like to have the register button problem fixed and also, if possible, any way to make my fps a stable 60 fps. Sometimes I go down to 49 fps and when I play 4 players, it goes to around 20-50 fps. I would like to squeeze every little FPS I can get so I can play SSBM much better. (In the menu screen I get 60 fps and sometimes 59 FPS. In training mode it's 50-60 fps, 60 fps when i'm not really doing anything.)

Thanks for the help.