Good choice @rp33! I am thrilled with my G74 even nearing the 6 month mark of ownership, and thanks to that full wipe and a clean install in week one, I have never had any of the issues with my system that forum users troubleshoot here, either hardware or software...except for the annoying keyboard lockup when you disable the trackpad in the BIOS. But they all do that I'm told.
Now you won't need to do the drastic things I did (delete partitions, remake new ones, format, and install: I needed a dual-boot Linux system) but the guys on this forum are experts on the Windows side of reinstalls. Its good practice anyways, since Windows tends to bork itself over time, and a clean install is usually called for >=once per year.
You've come to the best place for help and sharing G74 knowledge...theres no other place like it online for G-series owners. Welcome!
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G74SX-CST1-CBIL, i7 2630QM 2GHz
32GB DDR3 RAM @1333MHz
GTX560M 3GB DDR5 (192 bit)
17.3" LED 1920x1080
Sentelic TP, BIOS 203
Debian Linux Wheezy (Testing) Kernel 3.2, NVIDIA 295.40