You can always google an error message. Google "LNK1104" and the first page you get is:
It basically means what it says.
More specifically it means it can't open the file with write permission.
The typical reason for that is the file is still open somewhere else.
Most likely your program is still running from the last time you ran it. Might be hung trying to dump debug information from the latest crash -- in which case you probably have to kill the process with task manager before you rebuild it.