HELP: Blocco del pc quando inserisco un floppy

[alpha45]

Salve.
Quando inserisco un floppy con collegato un altra periferica usb esterna
come ad esempio una flash driver, mi si blocca il pc irreversibilmente.
Mi resta solo la possibilità di resettare il SO per farlo ripartire.
Mi sapete dire quale è la causa?
Ho provato con XP, Vista e win7, ma il problema persiste.
la descrizione dell'evento penso sia questa:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-Kernel-Power"
Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>2</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2009-07-16T07:09:04.062500000Z" />
<EventRecordID>17317</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>Piero-PC</Computer>
<Security UserID="S-1-5-18" />
</System>
- <EventData>
<Data Name="BugcheckCode">0</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0x0</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">false</Data>
<Data Name="PowerButtonTimestamp">0</Data>
</EventData>
</Event>

oppure questa:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-WER-SystemErrorReporting"
Guid="{ABCE23E7-DE45-4366-8631-84FA6C525952}" EventSourceName="BugCheck" />
<EventID Qualifiers="16384">1001</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2009-07-16T07:09:16.000000000Z" />
<EventRecordID>17336</EventRecordID>
<Correlation />
<Execution ProcessID="0" ThreadID="0" />
<Channel>System</Channel>
<Computer>Piero-PC</Computer>
<Security />
</System>
- <EventData>
<Data Name="param1">0x00000124 (0x00000000, 0x85670024, 0x00000000,
0x00000000)</Data>
<Data Name="param2">C:\Windows\Minidump\071609-23062-01.dmp</Data>
<Data Name="param3">071609-23062-01</Data>
</EventData>
</Event>

grazie