This seems to be a common error but the fix isn’t always the same. I’ve attached the FRST file in the hopes Essexboy or someone else can help. I have a solid state Samsung drive so I doubt physical drive failure is the issue.
Initially we will reset the registry, if that fails I will then uninstall Avast
Download the attached Fixlist.txt to the same location as FRST
Run FRST and press Fix
On completion a log will be generated please post that
Then try a normal boot
That didn’t work. Log attached. I’ve already run the one you made in another post to remove AVAST. I’m afraid I just overwrote that log when I did this one…
Could you run a fresh FRST scan for me please
Here you go…
OK this will uninstall Avast. What happened prior to the boot failure
Download the attached Fixlist.txt to the same location as FRST
Run FRST and press Fix
On completion a log will be generated please post that
Ok, now it is hanging at classpnp.sys. Log attached.
OK then we can’t blame Avast for this
From a command prompt run the following :
Chkdsk C: /r
Once completed try a normal boot
No errors found, and still hanging at classpnp.sys 
What happened prior to the stalled boot ?
Windows updates. I tried a system restore, but that didn’t work either…
Ok, I figured it out, and how I figured it out is pretty funny. I had basically resigned myself to having to reinstall Windows, so I went to make an Acronis backup of my OS drive because I do have some data on there I need.
My machine has a total of five hard drives in it, and only the OS drive is solid state. When I tried to back it up to one of my Seagate 1.5TB storage drives Acronis starting throwing write errors. As many of the posts here reference hard drive failure as a cause of the aswrvtsys hang, I went into the BIOS, disabled the controller the two big Seagate drives run on, and voila! - the system booted and completed the system restore I had attempted about a week ago, lol.
I just ran Windows Updates and rebooted, and everything appears to be working just fine. Now I just need to RMA this drive.
I really appreciate your help!
That’s good as that was going to be the next avenue, disconnecting the other drives 