I have found that this tip I found on the Nokia Support Forum solved my problems so I hope that it helps you to.
If your computer has Microsoft Windows Vista:
To reset the DRM files on your PC, first close Nokia Music if it is running, and complete the following:
1. Select Start > Computer > Organize > Folders and search options.
2. Select View > Show hidden files and folders.
3. Unselect Hide protected operating system files/folders and Hide extensions for known file types.
4. Locate your DRM folder. The folder is located at C:\ProgramData\Microsoft\Windows\DRM from Nokia Music Store. If the DRM folder cannot be found, go through the steps above carefully, to ensure that the correct options are set.
5. Rename the DRM folder DRMBACKUP
If the DRM protected tracks from Nokia Music Store are now played, your system will perform a security upgrade, which resets all the necessary DRM files. Each track requests a new license when first played.
These five steps will resolve the DRM error message
If your computer has Microsoft Windows XP:
To reset the DRM files on your PC, first close Nokia Music if it is running, and complete the following:
1. Select Start > Run, type control folders, and press Enter.
2. Select View > Show hidden files and folders.
3.Unselect Hide protected operating system files/folders and Hide extensions for known file types.
4. Locate your DRM folder. The folder is located at C:\Documents and Settings\All Users\DRM from Nokia Music Store. If the DRM folder cannot be found, go through the steps above carefully, to ensure that the correct options are set.
5. Rename the DRM folder DRMBACKUP
After this, please upgrade the DRM components using by visiting the link below:
http://services.wmdrm.windowsmedia.com/indivSite/en/indivit.aspI RESTARTED MY COMPUTER AS SOON AS I HAD DONE SAID TASKS !!
