You should be able to access this camera's memory without installing any software on Windows 7. When connected via a USB cable, the camera's memory will appear as a disk drive in "My Computer", and you will be able to copy files from there. This may be less convenient than the way you are used to working, but you will be able to get your pictures.
Another way that people get pictures off any camera that uses memory cards is take the card out of the camera and put it into a card reader attached to the computer. Some people prefer this method over using a cable. You would need a reader that can read xD cards.
You can download a manual from Olympus on this page.
Olympus does not currently have any software updates available for this camera. The Olympus Master 2 software pages claim compatibility with Windows Vista, but not Windows 7, and there does not seem to be any update available.