Yup, that's a bad one. Here are nukeing instructions:
Please note: This fix requires editing the registry. If you have never done this before, I highly reccommend you find someone local that can assist you, as you can ***** up your computer if you do this wrong, requiring a windows reinstall.
Open the registry (click 'Start', choose 'Run' and enter 'regedit'), find the key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run, right-click the entry 'msbb' inside it, and click 'Delete'.
To delete nCase/Alert, also check for a randomly-named entry three or more letters long, pointing to a .EXE of the same name in the Windows folder. Delete this entry and the file it points to. Alternatively, wait for the next restart and it should prompt to you reinstall or remove itself.
Restart the computer and you should be able to delete the 'nCase' folder inside Program Files. In older versions without an 'nCase' folder, look in the System folder (inside the Windows folder; called 'System32' under Windows NT, 2000 and XP, or just 'System' on Windows 95, 98 and Me), and delete msbb.exe.
To clean up, you can also delete the registry keys HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\nCASE, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\msbb and HKEY_CURRENT_USER\Software\180solutions.
To delete nCase/Inst, if you have the nCase/Inst variant, open the Downloaded Program Files folder inside the Windows folder, right-click the 'nCaseInstaller Class' entry and choose 'Remove'.