@PeeWee, thanks for your attempt to help. I have hunted everywhere for the AppData folder, have updated my folder options to "Show hidden Files/Folders", and searched the Microsoft website. I feel like a dolt! I can not enable this function, and therefore seem incapable of clearing my cache. I have rolled back my computer to a couple days ago, before all the driver updates and SL is still crashing on startup for me, which tells me the problem is located in the cache. Further suggestions?
I've also deleted and reloaded SL several times amidst all this.