Thanks for replying defjam, as the problem has reared it's ugly head again. I tried your advice (I had tried installing those drivers previously, and as you said they had failed), but even with your linked .inf file, it still wouldn't install. I then realized that your link was to driver v270.90 and typed in http://www.laptopvideo2go.com/drivers/win7x64/275.33/disclaimer, and it has started installing! Minor mistake, and I don't hold it against you at all. Thanks a bunch, and I'm installing it right now, I'll update with progress! Thanks again!!!
Hmmm.... nope, it's still doing it when it's running on AC power, even though the drivers updated. I found out that it does work okay whenever the Max CPU speed is set to low, but that kinda sucks for non-gaming purposes, not to mention that the game runs slower. Darn, I thought that would for sure fix it...
I tried setting the Power Management in the nVidia control panel to max performance like you said and the problem seems to have gone away, although it was still persistent for the first few seconds of gameplay. Odd... If this changes at all, I'll let you know. MORE TESTING!!!
Okay. So. I think I found out something kind of important. I closed the current game (Dragon Age: Origins is the one I've been testing this with, although all other games that used the GT 555M were giving me the same problem) and reopened it. The issue was there. I closed it, reopened it, and it wasn't. I alt+tab'd out, set it to high performance, and alt+tab'd in, and it still ran smooth. I closed the game, reopened it, and the problem was back. So it seems to be random then. I have no idea why it would be random like it is, but it most certainly is. I don't know if it's an issue with Steam (the game client I'm using) or with certain games, but for now it seems that if I close the game and reopen it, the game MAY run smoothly, or it may NOT. Why? I don't know. I'm confused as to why it would work just gravy one time, and then another play just HORRIBLY. No settings changed, and it runs like poo.