Keyboard Problems?

[WTFBrandon]

Well... i don't know if this really relates to the topic but... this is the only place where I know I will get a good yes or no answer, and since google obviously doesn't help at all...

ANYWAYS, down to the problem.
I just got a brand new laptop like... 2 days ago? And i've noticed when im playing Stepmania I can't hit a certain combination of arrows =S
For example I can't hit left,right and up all the same time. The up doesn;t work. Down works but up doesn't...
There are a few other combinations but I haven't been able to find out what they are yet. And see this is a real big problem on FFR too for fast or hard songs, because you need to go fast. But my keyboard doesn't register them if it goes to fast...

So im wondering if there is a fix for this problem? If nobody knows I might just check Dell tonight when I get back from school and see if there is a driver I can get or something.
Or maybe the rumors are true that Windows Vista is this horrible and you can't do anything good on it.