Garmin Express 4.0.23.0 crash at startup Win7 x64 SP1

I just installed Garmin Express 4.0.23.0 (for the first time). No errors during installation , but after launch the appliccation crashed.
On the eventViewer i have:

- <Event xmlns="schemas.microsoft.com/.../event">
- <System>
<Provider Name=".NET Runtime" />
<EventID Qualifiers="0">1026</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2015-06-11T19:09:14.000000000Z" />
<EventRecordID>176592</EventRecordID>
<Channel>Application</Channel>
<Computer>Mauro-PC</Computer>
<Security />
</System>
- <EventData>
<Data>Application: express.exe Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.BadImageFormatException Stack: at Garmin.Omt.Util.Overrides.UpdateOverrides() at Garmin.Omt.Util.Overrides.get_Culture() at Garmin.Omt.Express.App..ctor() at Garmin.Omt.Express.App.Main()</Data>
</EventData>
</Event>

AND

<Event xmlns="schemas.microsoft.com/.../event">
- <System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2015-06-11T19:09:16.000000000Z" />
<EventRecordID>176593</EventRecordID>
<Channel>Application</Channel>
<Computer>Mauro-PC</Computer>
<Security />
</System>
- <EventData>
<Data>express.exe</Data>
<Data>4.0.23.0</Data>
<Data>5568df16</Data>
<Data>KERNELBASE.dll</Data>
<Data>6.1.7601.18869</Data>
<Data>556363bc</Data>
<Data>e0434352</Data>
<Data>0000c42d</Data>
<Data>1af0</Data>
<Data>01d0a47a08020a14</Data>
<Data>C:\Program Files (x86)\Garmin\Express\express.exe</Data>
<Data>C:\Windows\syswow64\KERNELBASE.dll</Data>
<Data>5a205b3c-106d-11e5-a0bb-842b2bb3e554</Data>
</EventData>
</Event>

Any ideas ?
Thanx.
Mauro.