I too have Windows 7 64-bit. I have been using the standalone soapUI desktop application (v3.5) for some time now with no problems. Today I installed the soapUI Eclipse plugin (v3.6.1) and it gives the following error when I try to import a wsdl:
com.eviware.soapui.support.SoapUIException error importing wsdl
The underlying problem appears to be
java.lang.Exception: java.io.CharConversionException: Malformed UTF-8 character: 0xfc 0x68 0x72 0x74
Not sure why the plugin v3.6.1 is balking at the same wsdl that standalone v3.5 imports with no problem. Perhaps the newer version has a bug.