No problem
Answer 1. you can convert it to VMDK , you can login with local administrator change the name and re-register on domain with new IP address
2. create a new VM on workstation by selecting advanced menu , then you will be prompted to select your VMDK manually . If you do it this way then you will not get vmx errors
please try converting your win7 with VMWARE standalone converter , if you get any issue let me know .