Let's see if a new Windows account makes a difference. Create a new one with administrator privileges. Then launch FC 26. If it still doesn't work, see below.
Try checking the Reliability Monitor. Hit the Windows key + R. Find the red X for the FC 26 crash and double click it to view the technical details. Take a screenshot or copy the text for me.
You can also check for Windows Error Reporting. Go to C:\ProgramData\Microsoft\Windows\WER\. Loo in these folders: ReportArchive and ReportQueue. Search for folders containing fc26 or dbdata. If you see one, open it and look for files like Report.wer and WERInternalMetadata.xml. Just uploade the report.wer file if you have one.