help after anti virus

Hello,

after having plug-in my usb key, with a lot of port applications, in a chinese computer running a chinese anti virus, the chinese anti virus did I dont know what in the usb key.

The result, when i use my usb key, I can still launch the 'StartPortableApps " but the folders disapeared... I can still access
the "video, music ..." folders through the portable apps menu, but cant access the portableapplication folder.

It doesn't appear to be in my usb key, although I know it's here because I can launch the applications.

Any idea to help me ?

thanks,

Arnob