Help with Trojan

[Josephus]

FWIW, i didn't do any of this stuff. Using my secondary account I downloaded a different anti-virus program becuase the one I had installed was deactivated by the trojan. With this new one I scanned my computer, it found the trojans and ostensibly deleted them. I logged back onto my primary account, the infected one, and while I was no longer getting the annoying "Your computer is fucked" pop ups, I still was unable to access the desktop which was black. I did an explorer exe command but that didn't seem to do much, but at least I was back in control.
Except the next time I logged on it seemed to be taking its time and it said "preparing desktop". Turns out I lost, or it lost, my primary account and I could only log onto to it as a "temporary user".  I am no longer able to log onto the primary account. I can still work on my secondary account which is what I'm using for now.

[DontSayBanana]

Sounds like a one-two punch of registry hooks and on-startup services.  The problem with those sorts of malware is that you have to neuter both the hooks and the services, or they'll just reactivate themselves on the next startup/login.

Needs verification, but I've heard in a couple of places that antivirus treatment of services is touch-and-go in Win7 because it puts services outside the reach of typical executable programs.

[Cerr]

FWIW, i didn't do any of this stuff. Using my secondary account I downloaded a different anti-virus program becuase the one I had installed was deactivated by the trojan. With this new one I scanned my computer, it found the trojans and ostensibly deleted them. I logged back onto my primary account, the infected one, and while I was no longer getting the annoying "Your computer is fucked" pop ups, I still was unable to access the desktop which was black. I did an explorer exe command but that didn't seem to do much, but at least I was back in control.
Except the next time I logged on it seemed to be taking its time and it said "preparing desktop". Turns out I lost, or it lost, my primary account and I could only log onto to it as a "temporary user".  I am no longer able to log onto the primary account. I can still work on my secondary account which is what I'm using for now.

It could be a registry issue. Run ccleaner. There's a tab called registry, click on it and then scan for issues.

It also might be worth running a full scan with Malwarebytes and/or Superantispyware, to make sure you've got rid of the trojan completely.