Runs very slow

[Ranassa]

I bought this game a few hours ago on Steam, I started it and noticed that the game was running rather slow. So i exited the game and went to check on forums what the problum might be...

When i tried to start the game again, it took about 2 minutes before it actually reacted. And then it took 2 more minutes to get to the menu, and it isn't playable like that...

Is there anything I can do?

Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.090803-2339)
System Manufacturer: ACER
System Model: Aspire M3641
BIOS: BIOS Date: 09/11/08 10:58:15 Ver: 08.00.15
Processor: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2.4GHz
Memory: 3070MB RAM
Page File: 1870MB used, 4476MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11

Wasn't quite sure what information i had to add =)