dellengwyn

OK, my solution worked. Here's what I did: 1) I made an Ultimate Boot CD for Windows. You will find downloads and instructions here: http://www.ubcd4win.com/howto.htm You'll need a Windows CD and the package you download from the UBCD4Win website. If you have a laptop (or a friend's computer), you can do this easily. It was a very smooth process. 2) I started my poor desktop computer and went into BIOS by pressing DEL immediately. I then changed the boot order of the machine so that the DVD/CDROM is the first boot device. 3) I restarted the machine with the UBCD in the drive. This takes some time, but eventually, you will have a Windows OS running entirely from the CD. This will allow you access to your hard drive(s) and other media, like a USB drive. 4) I navigated to the MalwareBytes log files folder, C:\Documents and Settings\*your user name*\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Logs, and opened the most recent log file using the UBCD text editor. This contained a list of the registry keys deleted. 5) On my laptop, I opened RegEdit by clicking Start>Run and typing regedit. I navigated to the \atapi keys that had been deleted on my desktop. I right clicked on each key and chose "Export," then gave each exported file a descriptive name like "currentcontrolset". Regedit will save these keys and their subvalues as ".reg" files. 6) I put these files on a jumpdrive and plugged it into my desktop. UBCD's OS had no problem reading the drive. From there, in the UBCD OS, I chose Start>Program Files>Registry Editors>Regedit (remote). I was prompted to select from the User names on my system; I chose Administrator. This opened up a Regedit window. 7) I confirmed that the \atapi keys were, in fact, missing. Then, using Regedit's File>Import feature, I imported each of the .reg files on the jumpdrive. 8) I closed the programs and restarted and ..... Bob was my uncle! I mean... It started up normally. Whew! I hope this helps people.... Good luck!

I'm having the exact same problem. I suspect that, if you have a Boot CD, like Ultimate Boot CD for Windows (or can make one on another machine), you could probably put the registry entries back. I'm working on this, and I'll report back on it.