Asus advertises the G75VW as a "gaming laptop". With a pretty 17" screen, fast i7 CPU, NVidia GPU, lots of RAM, etc.

But, alas, "gamer-centric Design" circa-2012 looks in hindsight like a ROG-rebranded "generic laptop" with added backlights and bling. Your G75VW uses a cheap keyboard (part number 0KNB0-9410US00, made by Chicony I think), with simple 2-layer key matrix circuitry and a simple FTDI controller chip, a very common low-cost and low-complexity "2KRO" implementation for basic alphanumeric keysets.

You can't fix the problem without seriously modding (redesigning and rebuilding) all the electronics in your G75VW keyboard.

I'd recommend an external gaming keyboard. "Gaming-optimized" means that the WASD cluster is designed to take precedence over other keyboard regions when multiple keys are pressed. 6KRO is the best supported by the old PS/2 interface (which never requires drivers) and is quite sufficient for many gamers - USB keyboards can support "antighosting" and full-NKRO or 26KRO, etc, which will certainly not tangle up a handful of simultaneous WASD keypresses, but most of these claims are overhyped and meaningless (except for those among us who can type with 26 fingers).

I use an old SteelSeries Merc Stealth keyboard for laptop fps gaming (just can't stand laptop keyboards, too small and squishy and fragile for manly gaming). It ain't super pretty, it's certainly not portable, it's a horrible beastly thing to use for day-to-day typing, and it's utterly impossible to use for programming tasks, but it's an immovable indestructible infallible panzer for big-button smashy keyboard gaming sessions.

Maybe the WASD keys have seen a lot of use on that unit, lol. You could clean and repair individual keyswitches on your laptop, and there's plenty of guides, although it is delicate work on some laptops and impatience can result in permanently damaged (malfunctioning or just plain ugly) keyswitches or keycaps.

Perhaps the simplest solution is to remap your key bindings. Maybe try playing on QWES or on the Numpad? The scansets on low-KRO keyboard matrices have signal paths which intersect each vertical key column (1QAZ, 2WSX, etc) with each horizontal key row, and they divide the keyboard into "blocks" (alphanumeric, numpad, F keys, mod keys), they will produce many conflicts within each "block" just like the one you describe. Run a keyboard test to see which particular key combinations work and do not work on your keyboard. A quick-n-dirty measure of keyboard quality is to simultaneously hold down both Shift keys while typing every letter, here on my cheap office keyboard I get "TEQIKBRWNFXJMPSVERTELAZYDG" lol.

If the keyboard is already damaged then it might be worth buying a replacement part. (Note that Asus replacement parts can be purchased from many non-Asus sites, often at much lower costs, lol.)

I can't comment on issues between WinOS driver versions. The G75VW ships with Win7x64, it's probably best to stick with Win7x64 when running Asus-provided software/drivers. But you've already got Win10 installed, and this keyboard quirk seems a small issue which is not in itself enough to be worth the hassles (sometimes the massive hassles) involved in a full WinOS retrograde. Again, an external keyboard is a good workaround.