You should be just fine. Here's the specs page for your MBhttp://www.asrock.com/mb/overview.asp?Model=P45XE
It supports up to 1200MHz RAM, 1066 is normal for this type of board. And the BIOS allows full control of DRAM voltage up to 2.7V!!
When you first fire up the system, choose to load the BIOS defaults, just to make sure it's been cleared and setup properly. You may want to select one of the "performance" settings - likely "Performance IDE/SATA". Then go into Advanced and change the DRAM voltage to 2.2V and the Frequency to 533.
Reboot and make sure it shows the right amt of RAM and right speed. You can go in later and play around with the timing for the RAM, but get your OS installed first at normal settings.
Never heard of that RAM brand before, hope it works out. Good Luck