Hi Michael,
Sorry for your issues. First, try to listen to the ideas and see if you can execute them and then report back. It is difficult for us to troubleshoot if we are suggesting some things, and you are doing others. Which I know it's hard to wait, and it's not like ten people are helping.
When you get in a situation where things suddenly start acting funny, and you have a possible detection of a virus, randomly trying things out are the worst thing you can do. As Sandeep suggested, isolating the problem computer from the network and then troubleshooting later in the evening when things are quiet and calm would be better.
Also, it doesn't make a lot of sense to run a backup, if you think there may be a virus present. You are just backing up the virus. In fact, I think you mentioned your A/V finding something with a backup file.
The first thing I would do is to research the malware, which looks like it is a trojan. This could be very real or it could be a false positive. So, what you are looking to do is ask, "Is my computer infected, and how do I get rid of the virus?" So, there are many A/V, anti-malware programs out there. The first one to run would be MalwareBytes Antivirus (MBAM), just the free version that is used as a 3rd party tool. This is a very good program, which may show that the computer is clean. (Doesn't mean it is). Or it may find it, and tell you it is quarantined and show you the path. You can then delete it.
One of the error messages is very revealing. The locked file you are seeing is one of the SQL Server databases in your AC folder for codes. It is even telling you that another program has access to it. I don't know if that is the trojan or just another program. AC is also notorious for being seen as a virus even if it isn't.
Using two hard drives will basically be the same as reformatting your computer. I am not quite sure what you mean by rebuild...
At this point, not using the questionable computer, making sure the others are clean by running multiple A/V applications and multiple A/V companies' website detections that can run from the cloud would be helpful.
You can simply reinstall v6 on one of those machines and choose to install SQL there. But, you will need to restore with a backup that was pre-malware.
Here is the 1,000,000 question. What is your full computer backup. Having just an AC backup is not enough. For instance, if you have a virus on your computer, just restoring a good backup, while it may solve the problem, may leave the virus behind. A good 100% clean backup could be restored.
The saying "Once infected, always suspected," is definitely applicable here. If you fix things, installing new drives and reinstalling Windows and AC will insure you are OK.
A few other things:
As you tell everyone what you did, you want to keep it straightforward and in order. Every step you try. Try not to use extraneous info like a hacker go to your bank's credit cards. Sorry about that.

So:
1. Found this error message
2. Ran MBAM twice and nothing came up
3. Tried reinstalling, AC (which will likely not help)
4. Tried what kurt suggested and this happened
There are many sites that will tell you how to uninstall a virus. You have to make sure it is a reputable site, as it is easy for hackers or people with malicious intent to use malware to draw you to their site.
An antivirus program is no enough protection in this day and age. It is important to have a zero day anti-malware program that does not depend on definitions. They also say run an A/V program with it. Although there is some argument on that. I do.
There is also a site called Experts-Exchange, which you can get a trial membership for a week. Asking about being infected by that virus will likely get you help from people who know more about virus that most. They are experts who just help from Britain, Australia, U.S., etc. But, if you ask a question there, you would want to do everything they suggest. They know of MBAM and Combofix and VirusTotal and the way to run them. They may know if this is a false positive.
If you went that route, which would be very helpful, I would just focus on the question that I ran my A/V and it came up with this. What should I do? You can add other stuff later. If you write everything in your posts above, everyone will be confused and not even attempt. They have examples of how to ask questions, even mods who will help you write them.
Good luck.