I suggest that you try after uninstalling Qlikview, going to Local Settings and delete the QlikTech folder before re-installing.
If Local Settings doesn't do the trick:
There are also registry settings that remain after uninstalling under HKEY_Current_User\Software\QlikTech.
Try deleting the registry key as well. The re-install will recreate both. As always, registry edits are at your own risk, so backup first.