This tells me that your newly reinstalled BOINC is trying to launch the science app but that the app can't start properly because something is screwed up.  My guess (and that's all it is) is that the reinstall of BOINC has created some sort of problem where something is missing at your end that causes the improper launching of the science app.  It is absolutely not normal to see messages like "Can't open init data file - running in standalone mode" and the subsequent errors that follow after that.

If your account file (mentioned in the previous message) actually exists, and if you can open BOINC Manager (advanced view) and communicate with the running client, you could go to the projects tab in BOINC Manager, select the Einstein project and then use the 'Reset Project' button to force BOINC to talk to the project servers and get a fresh set of everything.  Perhaps that might fix whatever is wrong or missing.  If, when you try to force a project reset, there is some sort of error condition or message, please copy and paste the full details of that from what is recorded in the event log of BOINC Manager.  If you perform certain actions along the above lines, please document the steps you take and the event log output that you see.

Because I'm not standing and looking over your shoulder at exactly what you do and because you don't mention everything you did do, it's very difficult to imagine what the problem exactly is. I have no experience with the sort of messages you're now getting so no clue at what might be causing them.  The event log information is much more important here because that might help us understand the conditions that caused the error messages in stderr.txt.

@ Bobby Conger,

When you have an active thread going on with several people already having contributed (and probably others following on to see how the issues get resolved) it's not really appropriate to decide that you want personalised support via PMs.  If you need ongoing assistance, you should post your queries in the thread that already exists.  That way, all can contribute and since different people will have different experiences, you will probably get a much better answer.  You also get good peer review of answers that may be flawed in some way.

A further benefit is that others having similar problems are able to find the discussion and perhaps be helped without having to go though the entire process all over again for themselves.

If you really have removed all the previous BOINC configuration, you will need to go through the standard BOINC process of attaching to Einstein (add a project) and getting a new host ID and a new account file (account_einstein.phys.uwm.edu.xml) sent to you as part of the 'add a project' process.

Before you do that, you should do a thorough search for that particular filename on your computer in case you have a backup copy or in case it wasn't actually removed but rather moved to some other location.  I know nothing about Windows but surely there is some simple file search to see if a copy of that file still exists anywhere on your computer.  If so, it would save you having to add the project once again.

Also, if you have any other computer that has previously run Einstein tasks, you will probably have a usable copy of the account file on that computer as well.  It would be worth your while to check, since finding that file would allow you to keep your current host ID and the stats that it has already accumulated.

As I tried to point out in a previous message, this account file has nothing to do with your website login arrangements so if you ultimately do have to 'add the project' once again, you would just continue using your existing forum login, email address and password.