You have to be the computers administrator to change any values on any hard drive on your computer click start control panel user accounts on the users tab click the name of the computer administrator you must have full control click start click to open on my computer you should see your usb drive could be E: or something right click select properties there will be an array of options select the sharing tab option then advanced sharing make sure you have a tick in the share this folder box then click permissions make sure you have all 3 boxes ticked full control changes and read in windows 7 click start control panel user accounts click on the administrators account if you have made one or you will have to create one in windows XP click start right click on my computer select open
Right click the icon of your usb drive (It should be E:/ or something)
Click Properties in the menu that comes up
Click the Sharing tab
Click permissions
And finally, click Allow next to Full Control.


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Hope this helps.