- Shut down the QlikView Services.
- Make a backup copy of C:\ProgramData\QlikTech (may take a while)
- Make a backup copy of your Document root (including all mount points)
- Reinstall your server
- Reinstall QlikView in the same location as before.
- Replace the contents of C:\ProgramData\QlikTech with the backup copy (can take a while)
- Restore your Document root and all mount points
- Restart QlikView services
As an additional safeguard, check the NTFS rights in the QlikTech folder before removing it. Or restore the folder as your service account.
Also, do not forget to reinstall/recreate all data channels (ODBC, OLEDB, custom connectors etc.), shared folders, custom data files etc.