Hmm, 275.33 installed fine without any problems on my G73JW.
There is a way to modify NVAM.inf file to force any drivers to install on your G73. First you need to find driver version that installs fine on your notebook. Check C:/NVIDIA/DisplayDriver/ - NVIDIA stores the installation files there. There should be "266.58" and "275.33" folders there. Go to 275.33/Vista 64-bit/International/Display.Driver/ and find "nvam.inf" file. Open the file with notepad, highlight and copy the first 10 lines. It should look like this:
; NVIDIA Windows Vista / Windows 7 (64 bit) Display INF file
; Copyright (c) NVIDIA Corporation. All rights reserved.
[Version]
Signature = "$Windows NT$"
Provider = %NVIDIA%
ClassGUID = {4D36E968-E325-11CE-BFC1-08002BE10318}
Class = Display
DriverVer = 05/20/2011, 8.17.12.7533
CatalogFile = NV_DISP.CATNow go to to overwrite the old file and run Setup.exe located in 275.33/Vista 64-bit/International/.
266.58/Vista 64-bit/International/Display.Driver/ and open nvam.inf. Delete the first 10 lines and paste those copied from 275.33. Save file and copy it to 275.33/Vista 64-bit/International/Display.Driver/,
HERE is a link to the original instruction (the driver versions are different).
To sum it up: you need "nvam.inf" file from 266.58 (or any other that installs fine on your PC) with first 10 lines from 275.33's "nvam.inf". Place this file in 275.33/Vista 64-bit/International/Display.Driver/ folder and run Setup.exe.
If you don't want to risk by doing it yourself
HERE is a link to Chastity's drivers -
Verde 280.26 WHQL ModINF (08/13/11) - but it's 280.26, for some people it works fine but I've read that in some cases it may damage your card.