The Adobe error is spurious since you obviously have an abundant amount of memory available.
It is possible that Adobe is unable to write to its cache file, a location on your Mac for Adobe to store data such as thumbnail and preview images, and Adobe Bridge is erroneously reporting that inability as insufficient memory.
You should really solicit Adobe's help for this problem, but if you are willing to continue pursuing it here consider the following:
Open Disk Utility - it's in your Mac's Utilities folder. In the column on the left, locate your Mac's startup volume. It is an icon located below the uppermost icon and is usually named "Macintosh HD". Select it and click the Repair Disk Permissions button. It will take a few moments to complete. Many "Permissions differ... " and "Repaired... " messages will appear, perhaps hundreds of them. They are not important, but if any errors appear please describe them.
When Disk Utility finishes with the message Permissions repair complete, quit Disk Utility and determine if Adobe Bridge continues to report the low memory condition.