As an aside, and because I completely forgot the first time around, my wife took her old hard drive, installed it in the new computer and reformatted it. Could that have anything to do with this?
Depends on how she installed the drive. Did yo make it master or slave? What is the speed of the drive? If the speed of the drive is slow, then its not going to be blazing fast like the new disks are.

Did you try to adjust the performance settings like I recommended.

The svchost isn't a virus. Look at my link above.

The virus is sCVhost.exe, not svchost... which, I didn't see it in your list.
And, your AV didn't catch it...