My first suggestion is to update your drivers, ensure that your system isn't infected, and update your system to Service Pack 1 (or Service Pack 2 which was just released). That will cure a multitude of problems.
2 of the errors were while PokerStars.exe was running, both crashed in core Windows files.
1 of the errors was related to video in DirectX - so I'd wonder if your video drivers were corrupted.
I'd suggest that the updates required to install Service Pack 1 (along with the malware scans) should either fix or reveal the problem. You can get some assistance with the malware scans here:
http://www.techsupportforum.com/f50/