[QGIS-it-user] Problemi di installazione QGis3

[Pontigia Fabrizio]

Scusate, sto cercando di installare QGis 3.0 partendo da OSGeo4W64.
Vorrei installare anche la versione 2.18
Ho fatto diversi tentativi, ma alla fine ottengo che la versione QGis2.18 
funziona,
la versione 3.0 va in crash all'avvio, riportando il seguente report:
h2. User Feedback



h2. Report Details

*Crash ID*: 2b13ba363e68d5bfba9db84847bbee01915c34c5


*Stack Trace*
<pre>
RtlFreeHeap :
HeapFree :
free :
DllUnregisterServer :
DllUnregisterServer :
CLSIDFromString :
CLSIDFromString :
CLSIDFromString :
CLSIDFromString :
DllGetClassObjectWOW :
DllGetClassObjectWOW :
CLSIDFromString :
CLSIDFromString :
CLSIDFromString :
CLSIDFromString :
CLSIDFromString :
ObjectStublessClient6 :
CoCreateInstanceEx :
ObjectStublessClient32 :
SHParseDisplayName :
Ordinal866 :
ILSaveToStream :
ShellExecuteExW :
ShellExecuteExW :
ShellExecuteExW :
Ordinal860 :
ShellExecuteExW :
ExtractIconExW :
Ordinal865 :
Ordinal865 :
QWidgetPrivate::registerDropSite :
QStackedWidget::`default constructor closure' :
QInputDialog::getInteger :
QgsDataCollectionItem::iconDir :
QgsDirectoryItem::icon :
QgsBrowserModel::data :
QSortFilterProxyModel::data :
QModelIndex::data :
QStyledItemDelegate::initStyleOption :
QStyledItemDelegate::sizeHint :
QTreeView::indexRowSizeHint :
QTreeViewPrivate::itemHeight :
QTreeViewPrivate::lastVisibleItem :
QTreeView::sizeHintForColumn :
QHeaderView::resizeSections :
QHeaderView::sectionPosition :
QHeaderView::sectionViewportPosition :
QHeaderView::resizeSection :
QHeaderView::setStretchLastSection :
QgsBrowserDockWidget::showEvent :
QWidget::event :
QDockWidget::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QWidgetPrivate::show_helper :
QWidgetPrivate::showChildren :
QWidgetPrivate::show_helper :
QWidget::setVisible :
QgisApp::QgisApp :
main :
BaseThreadInitThunk :
RtlUserThreadStart :
</pre>


*QGIS Info*
QGIS Version: 3.0.0-Girona
QGIS code revision: commit:001c80b0c3
Compiled against Qt: 5.9.2
Running against Qt: 5.9.2
Compiled against GDAL: 2.2.3
Running against GDAL: 2.2.3



*System Info*
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 6.1.7601

Ho un sistema operativo windows7.
A questo punto vorrei ripulire il tutto e ricominciare, cosa mi consigliate?
Disinstallo Qgis2.18, cancello la cartella c:\OSGeo4W64 e la cartella .qgis2 
nella sottocartella utenti?
Grazie per l'attenzione. Scusate ancora.