Sudden failure in DNN development environment

I've been working on a mixed desktop-and-web based solution for quite some time now. My local development environment was using VS2013-Pro, a recent DNN version (7.3, I think), Webmatrix 3, IIS Express 8.0, and SQL Server 2014 running on Windows 7 on Parallels on my Mac. Everything is up-to-date, all SP's installed, etc.

I developed a couple of REST webservices and a DNN module, and it's all been humming along and working really--shockingly--amazingly(!) well, when very suddenly:

I hit the DNN site and Webmatrix crashes and I get an error that says "IIS Worker process has stopped." And hasn't worked since. The debugger gives me the message "Unhandled exception at 0x762CC42D (KernelBase.dll) in iisexpress.exe: 0xE0434352 (parameters: 0x80131530, 0x00000000, 0x00000000, 0x00000000, 0x72F90000)."

I did not change anything, this started in the middle of a coding session. It worked fine for months, and then it just didn't any more.

I researched a bit and found several suggestions, none worked (delete cache folder, uninstall/reinstall). I find another post that mentions that Webmatrix is a dead product now. I try just to set up same site in IIS (following DNN's own instructions and a couple of other very similar sets I found). Still can't make site load--even the front page.

I download a fresh DNN install package (7.4 now) and try from scratch. Now when I try to load the site I get Visual Studio's Just In Time Debugger telling me an unhandled Win32 exception in w3wp.exe [2648]. I try running the debugger but it doesn't actually give any information.

I feel like other than the Webmatrix/DNN installation I've always had a lot of trouble getting DNN running locally, even following the directions to the letter. I need it running locally because I work disconnected a lot.

Am I missing something big here? Is anyone else having trouble all of a sudden? I've spent the better part of 4 days unistalling, reinstalling, tinkering, and can come up with nothing.

-Tim

OK, so after uninstalling everything (down to the metal, everything to do with SQL server, IIS, Webmatrix, and the recent .net framework updates) and then reinstalling them, I've been up and running for a week or so now. I've disabled Windows update, I think it was something in there that got me in this position in the first place. Not a great long-term solution, but it'll do for now.