I also have the G74SX-XR1 and im experiencing the same issues in wow. I got this notebook about 2 weeks ago. the game seems to pause for 2 seconds or so every once in a while. I have done all of the updates and it still happened. I finally turned on resource monitor to see what was going on and here is what i got.
http://imageshack.us/photo/my-images/835/resourcemonitor1.jpgthe cpu drops and the disk access shoots up. thats the lenght of time i had the freeze for. I have many of these screenshots tracking the same thing. you can see that the response time of the disk is 3590 ms. which is really long. I ran hd tune and everyhting looked okay
WDC WD6400BPVT-80HXZ
Transfer Rate Minimum : 45.3 MB/sec
Transfer Rate Maximum : 82.1 MB/sec
Transfer Rate Average : 68.6 MB/sec
Access Time : 18.9 ms
Burst Rate : 66.9 MB/sec
CPU Usage : -1.0%
Im still looking for a good fix for this.