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hi http://support.apple.com/kb/TS1567

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Restart the Apple Mobile Device Service (AMDS)
Windows XP
Close iTunes and disconnect the iPhone or iPod touch.
Choose Start > Control Panel.
Inside the Control Panel, open Administrative Tools.
Open Services.
Select Apple Mobile Device and click Stop the service as shown below:


After the service is stopped, Click Start the service.
After the Apple Mobile Device service has started again, open iTunes and connect the device.
Windows Vista
Close iTunes and disconnect the iPhone or iPod touch.
Click the Windows Start button
In the Start Search field type Services.
In the Programs section of the search results, Click "Services".
Select Apple Mobile Device and click Stop the service as shown below:


After the service is stopped, click Start the service.
After the Apple Mobile Device service has started again, open iTunes and connect the device.
Remove and reinstall iTunes and AMDS
If the issue continues after restarting AMDS, then you'll need to remove and reinstall AMDS and iTunes.

Completely uninstall both AMDS and iTunes. Click the appropriate links below for steps:
Windows XP
Windows Vista
Restart the computer.
Download and install (or reinstall) the latest version of iTunes from www.apple.com/itunes. Installing iTunes will also install AMDS.
Restart the computer.
Start iTunes and connect iPhone or iPod touch. The device should be recognized properly in Windows XP or Vista.