Adobe Bridge CS5 installs automatically with all Creative Suite 5/5.5 editions:
Adobe Bridge CS5 also installs automatically with the following CS5, CS5.1, and CS5.5 stand-alone products:
Because Adobe Bridge CS5 installs as part of the Creative Suite 5.x supporting product installer, it cannot be independently uninstalled. To remove Adobe Bridge CS5 from your computer, it's necessary to uninstall all Creative Suite 5.x editions and applications that use it. For example, if you have both Photoshop CS5 and Illustrator CS5 installed, uninstall both applications to uninstall Adobe Bridge CS5.
As with Bridge CS5, Bridge CS4 installs with supporting CS4 products, such as Photoshop CS4. To remove Bridge CS4, it's necessary to uninstall the products that support it. See the CS4 supporting product's release notes, available from the product's CS5 Help and Support page, for uninstall instructions.