Looking at the minimum requirements for that game, it recommends at least a Pentium 4 3Ghz or AMD Athlon 64 3200+, which are quite a bit older than your processor. As Synphul pointed out, there's more to a processor's speed than just the clock rate, and typically newer processors will run faster than older ones running at the same clocks. As an example, that Athlon 64 3200+ in the minimum requirements actually also runs at 2Ghz, and is generally a bit faster than the Pentium 4 at 3 Ghz.
A site called Userbench can also be used to compare the relative performance of processors, if you're unsure how yours compares to what's listed in a game's requirements. It might not always be entirely accurate, and performance differences can vary from game to game and system to system, but it should at least give you a rough idea. Comparing your
Pentium P6100 to a Pentium 4 at 3GHz, We can see that you're processor should be quite a bit faster than the recommendation, including the single-core performance. So processor-wise, it should be fine.
The graphics card requirements are also important to look at though. I'm assuming that your laptop only has Intel's integrated graphics, and it looks like those would be the first generation Intel HD graphics. Finding accurate performance specs on those can be a bit more tricky, but from what I gather, it looks like that integrated chipset should be faster than the GeForce 6600 and Radeon X1600 listed in the game's requirements. Some games don't support Intel's integrated graphics all that well though, and could potentially not run on them, which is something to keep in mind. If you're thinking of getting the game through Steam, they do offer
refunds now though, so long as you've played less than two hours and filed for the refund within two weeks, so if it didn't run properly, you could probably get a refund through that.