Hi. There are several places you want to look in to make sure everything is set all right.
First, select the solution, and open properties window. In Configuration properties > Linker > Input > Additional dependencies make sure that you have right version of libs included (cutil64.lib for x64 system and cutil32.lib for x86).
Second, make sure that in Target machine Configuration properties > Linker > Advanced is set correctly.
Third, choose properties of the source code file whose object file causes error, and go through them to make sure that it is set to compile for requested type of machine (if there are such options, it depends on CUDA build rule you use if I’m not mistaken)
How did you “choose wi32 mode”? Did you create new configuration with all properties copied from x64 configuration?