Display / Device Manager errors

I built a 95% new computer last month, and its been running flawlessly. I added on a couple older HD's for storage last week, and again was experiencing no issues. 2 nights ago, I powered down the PC and unplugged it and the Ethernet cable as we were expecting bad Tstorms and I didnt want anything getting fried. When I powered it back up the following morning, it ran a self HD check and found nothing wrong, and continued to load windows.

The first unusual issue I noticed was a long delay on the windows logo screen. Until that power-up, my computer never paused for more than a second or 2 on that screen. This time (and every time since) it pauses for a full 30 seconds before finishing the windows load.

Second, within 5 min of power-up, I got a HDD error "one of your drives is about to fail, please backup blah blah blah"

*NOTE* One of my HDD's, black or green, had this issue EVERY day when it was the main drive in an old computer. I turned the warning off back then and it ran perfectly for over a year.

So I disabled this warning and havent noticed anything other then the abnormally long load time.....until I tried to go in and change the resolution....

When I right click and select personalize, I get a "Explorer.exe Unspecified error"
When I go to control panel and click adjust resolution I get "Windows cannot find 24789ywer74gi3t45376rr3r\settings, make sure you typed the name correctly and then try again"
I get that same second error message when I try to open up the device manager.

I also just noticed that my network adapter shows its disconnected, though its working fine.

I'm hoping its a simple issue that someone can walk me through fixing. I'd rather not reinstall windows, although it wont be much of a problem if its the only solution.

Here is my current build, brand new as of 3 weeks ago.

*Items with a (*) Before them are recycled from older computers.

Processor : Intel Core i5 2500k
Motherboard : ASUS P8Z68-V LX LGA 1155 Z68 ATX
RAM : Corsair Vengeance Series 8GB DDR3-1600 (PC3-12800) x2 kits, 16GB total
PSU : Corsair HX750 750W Professional
Video : EVGA GeForce GTX 460 PCIe 2.0 x16
HDD 1 : OCZ Petrol 128GB SSD (OS lives here)
(*)HDD 2 : WD Black 1TB 7200 RPM
(*)HDD 3 : WD Green 1TB 7200 RPM
Display : Sharp Aquos 46" LCD, connected via HDMI
OS : Windows 7 Ultimate 64 bit