Hi. Christina.
You can locate the host file in windows: Path --> C:\Windows\System32\drivers\etc and the file name is hosts - open the file in notepad and you can find the entry for example: abc.xyz.com, where abc=hostname, xyz=domain. Just remove this entry and try to run the installation. If still the error not resolved feel free to post so that we both can coordinate and resolve the issue.
Please let me know if any more clarifications needed.
Thanks
Mohd