Frequent Crashes in Windows 7 (Stuck at loading classpnp.sys)

Srikanth VM,
You're welcome, that definitely is a problem which will cause all kinds of issues. But you may still need to re-visit a few issues like the native/ahci setting etc. You'll also want the Etron usb 3.0 driver for your board, and Creative Audio driver too if you ONLY did the lan drivers all from the gigabyte download page I gave before.
http://www.gigabyte.com/products/product-page.aspx?pid=4305#dl
Comes in with drivers selected on dropdown 1, then choose win7 64bit from the 2nd dropdown and you'll see the etron in that list. Otherwise you have generic junk loaded from Microsoft's default stuff (or nothing at all, showing issues in device manager in that case without proper 3.0 support) and you want specific drivers for your hardware if they are out there.

Not sure if creative card or the onboard is better. 98 SNR on creative and you'd have to compare features etc but drivers can be found below at creative site, download link on the page.
http://asia.creative.com/p/sound-blaster/sound-blaster-5-1-vx

http://social.technet.microsoft.com/Forums/windows/en-US/566cdd43-ce91-4e64-93e0-8d09d8fc1ea0/windows-7-fails-to-go-into-safe-mode-stuck-at-classpnpsys
Another comment I found on the classpnpsys problem which leads to a bad drive. User had a c and d drive (like you two drives) and had that issue until disabling them one at a time. Found it booted without the D.

"a late reply from me, but is migth be helpfull for people with the same problem as above. I got the classpnp problem but none of the solutions helped for me. A re-install was the only solution i could think of but even in a re-install the system hung during the installation. I begun to think what the problem could be and started to disconnect everything. At last i got to the harddrives and there was the problem, the cable was fine, but the d-drive (not the windows 7 drive) was not. After disconnecting it windows started and made me a very happy man.
Tuesday, April 12, 2011 6:47 PM"

Might not be a problem after chipset drivers etc. Just a thought if you encounter it still. Seatools might be able to fix the bad one if there is one, or worst case you find out it's bad before plopping tons of data on it. If you get the error again I'd say disconnect the NON OS drive first. If you still get it maybe clone the OS to the other drive with a boot disc or something (lots of free stuff on cnet, tucows etc for simple cloning) and try with that one as the OS and the other disabled.

Seagate HD repair app. Gives all kinds of drive info also, not as much as I'd like but should be on any seagate users PC. WD has a tool also which has good info also on smart flags etc, been a while since I used it (only have 1 WD running currently in use).

http://www.seagate.com/support/downloads/seatools/
You'd want the dos one if you can't use it in windows. Dos one is a burnable iso, so you can burn a cd with imgburn which is FREE. imgburn is the best free burner on the planet (heck maybe best burning app period, been using it for over a decade). There are seatools versions for dos/windows. Win version can repair some stuff, but dos version can repair more.
www.imgburn.com
just in case you need it, in tons of languages too

Edit: Adding if you're running IDE/EIDE, you can fix some problems switching from AHCI in the bios to native ide (the page in the manual I discussed before). Good luck

I'm not going to bash other platforms here as I myself can't wait to get another great gaming OS choice and I'm on the IT treadmill LOL (cmon android/steamos, keep gaining ground guys!!! ROFL). Having said that, please post if you're still having issues after chipset/all drivers loaded if you still want more help. Since no apps/data etc is invested in the windows OS (I don't think, might be wrong here, 10x in a month I wouldn't be investing much in case of blowing away again at that point and I'd have an image to spam it back quickly by now), you may just want a fresh install with chipset drivers coming first this time followed by the rest. Sometimes it takes longer to troubleshoot an issue after a simple mistake even (compounded by all the troubleshooting of drivers etc), than to just start fresh if there's nothing you're losing but a 1/2 hour of time here. But you've already installed so many times you may be sick of it and that is understandable

I might install my fav OS on the 160, disconnect it then install win on 500 alone. I do this myself to keep them from messing with each other. I have xp64/32 and win7 all on drives installed alone. I easily switch at boot and dislike OS managers. But I admit I live in win7 64 these days even though xp64 pro is STILL rock solid and unlike most people think, has up to date drivers for chipsets, both AMD/NV, most nics, my audigy sound card, even my wireless edimax card etc. When not available I've even used server 2003 drivers on some machines with no issues. I could go weeks or even a month without a restart on xp64 and then usually only on patch Tuesdays...LOL. That OS is great.

You could always load xp on one drive just to see if it works fine (gaming some on xp32 or 64 is a good test for new cpu/mboard/psu anyway if win7 not working out), and win7 on the other after (or *nix on this one so you can go both old ways). There is no harm in xp and you can trick it into getting patches anyway. This isn't a security risk even without patches being updated if you have a router, and up to date AV/IS suite with threatfire loaded (all people should have threatfire on top). China knows this despite what some in these forums would tell you. I tested the theory myself on a "dangerous" box for 2yrs with ZERO xp updates and was doing crazy crap all the time just to trash the box. I used comodo Internet security with threatfire on top. Still do the same in win7 (well not the totally foolish usage, just the IS/threatfire combo I mean). You can't really give up windows games yet can ya? I wish but it isn't easy for me. Maybe in a few more years when steamos/android give me enough fun I can pull that. But I'll likely have a dual/tri-boot for ages with a win copy in there for gaming even when I go steamos or linux on a drive. Maybe I just like more options than most Just some thoughts for you to ponder I guess if chipset drivers etc don't solve it still.