I have an 8GB SDHC card which I have used to upload pictures onto my Windows XP machine using an SD card reader ("SanDisk Ultra II"). I could also delete pictures and create folders on the card. I recently obtained a new computer that runs Windows 7 and, while I can view and upload the photos, I am unable to delete photos or create folders. When I attempt to do either of these two operations, the desired option does not appear in the menu ("Delete"/"New Folder"). Also, the shortcut keys do not work (e.g. the Delete key and Alt+F+W+F).

I have attempted to change the Properties from Read-only, but am greeted with a "media is write protected".

I should add that when I insert the Card Reader back into my Windows XP computer, I am granted full write permissions.

Why can't I modify the SD Card from Windows 7? And, related, how can I fix this issue?

Let me know if you have any additional questions. Thanks!