ASRock Z87 Extreme4 - changed case, reset cmos to enable booting, now onboard sound doesn't work.

I switched from a large L-shaped desk to a 72x30 "activity table", which has room under it to fit my old Silverstone RV03B-W without it sticking out, so I transferred most of my parts back to it. It already had a blu-ray reader in it, so I didn't bother transferring the blu-ray reader/dvd writer combo drive from my HAF XB EVO. Also, the 180mm bottom fans would make it difficult to install my H100i in the Raven case, plus I've decided not to bother overclocking after all, so I switched back to my Hyper 212 EVO. I had a little trouble getting it to boot, but resetting the cmos fixed that.

I also got a Logitech Z506 5.1-channel speaker system. I had the front, sub, and center speakers working in the HAF XB EVO case (I don't have long enough cables yet to connect the rear speakers the way I want to), but now that I've transferred to the raven case, I don't have Realtek Audio listed in the playback devices. I've connected the headphone output of my monitor to the red&white rca inputs of the Z506 so at least I don't have to use the awful speakers that are inside my Seiki TV. However, those won't give me 5.1-channel sound for my games.

In Device Manager, it lists three entries called "High Definition Audio Controller", and one of them shows an error "This device cannot start. (Code 10)". I went into the BIOS setup and made sure the Realtek audio was set to "enabled" instead of "auto" (just in case it was treating the hdmi out of the video cards as an audio card). I tried uninstalling and reinstalling the Realtek driver downloaded from ASRock's website, but that didn't work. I even tried installing the "Vinyl AC97 Combo Driver" (based on the last post here), but it refused to install.

I also just noticed that my system clock is running at about triple speed, which might be related - I opened the adjust date/time dialog and watched the second hand whiz around to show 1 minute elapsed, but according to my wall clock, only about 20 seconds had elapsed.

Can anybody suggest other things to try? I'd prefer not to have to buy a new motherboard already - I haven't even had this one half a year yet, and I'm not really happy with the forced cable routing of the Raven case - I have to squish the cables when putting the right side panel on. I have an ASRock H61M-VS and a Foxconn H61S in my spare components, along with an i5-2500k to put in them, but they only have 3 audio jacks in back instead of 5 + optical, so I'm doubtful they can really provide 5.1-channel audio to my Logitech Z506 speakers. Also, neither one supports SLI.

Thanks in advance for any help.

Edit: as far as the Windows clock issue, I've tried stopping the Windows Time Service (which said it wasn't started) and then starting it, but after restart, Windows Time was again not running. I also tried leaving the system off at the surge protector for more than 20 minutes, then turned it back on, and the time is still flaky. Animated gifs, Firefox's loading wheel, etc. also seem to be running at triple speed, but YouTube videos aren't.
 
Update: since I hadn't gotten an answer, and the clock ran at normal speed in the BIOS configuration, I figured I'd reinstall Windows in the hope of fixing this (not quite as drastic as replacing the motherboard), but I noticed that when I booted from the Windows install disc, the animations were still running fast. I went to the repair options and opened a command prompt. I used the "time" command twice separated by a minute going by my wall clock, and the second run showed the time had advanced by a little over 3 minutes.
 
I'm not sure this will help you, but sometime after my previous post, I got a Corsair 200R case (much easier to work in than the Raven case) and installed the H61M-VS in it (and a sound card to get 5.1 audio). A week or so later, I took my Z87 motherboard to a local computer store for diagnostics, and they couldn't find anything wrong with it, so I installed it in the Corsair 200R case, and noticed that one of the standoffs I had been using for the H61M-VS (micro-atx size) didn't line up with a hole in the Z87 Extreme4 (which is atx size). By that time I had already taken the Raven case for computer recycling, so I couldn't check it to be sure, but I might have goofed and left a standoff in that position when I mounted the atx board in it. The Windows clock and onboard sound work fine for me now.