Bresser 33-10001 Instrucciones De Uso página 34

Delete the so-called 'Ghost Devices' (devices that are
not currently connected to the computer). Background
information: Windows generates an entry in its system
preferences for each new USB device (e.g. USB stick)
for each USB drive it is plugged into. At every start of
the computer Windows will search for this unit. This
delays detection of USB devices as well as the launch
of Windows itself and is responsible for the failure to
recognize the USB port!
Therefore, you may 'clear up' your system environment
and remove unused devices. To do this, right-klick on
'My Computer' or 'Computer' and open the 'Properties'
item in the context menu. Then klick in the window on
the tab 'ADVANCED /ADVANCED SYSTEM SETTINGS'
and klick on 'ENVIRONMENT VARIABLES'. Now select
the lower part (NEW ENVIRONMENT VARIABLE). At
'NAME OF VARIABLES' enter the following text:
devmgr_show_nonpresent_devices
Enter the value '1' in 'Value of Variables'
Confirm the entry with 'OK' and restart the computer.
After rebooting open the Device Manager. Select the
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menu item VIEW and activate the option 'Show Hidden
Devices'. The 'Ghost Devices' previously hidden are
now displayed in grey. Check for entries in the different
categories such as USB, storage volumes, etc. Only
delete the entries of devices you no longer use from the
'Device Manager'.
Source: Microsoft knowledge base
1
http://support.microsoft.com/kb/315539/en