Yes, with the latest firmware (Version 1.15), the Olympus DS-4000 Digital Voice Recorder is compatible with Windows 7 32 & 64 bit versions.
Keep in mind that just because the device is compatible with Windows 7, that doesn’t necessarily mean the software packaged with the Olympus DS-4000’s is compatible. As you will see from the images below, I tested an Olympus DS-4000 on two machines, (Windows 7 32bit & Windows 7 64bit) using the Olympus Dictation Management System Release 6.
The computer and software recognized the device and automatically downloaded the dictations as expected.
Olympus DS-4000 DVR with Windows 7 32bit
Olympus DS-4000 DVR with Windows 7 64bit
Verification Source: eDist In-Lab Testing
Test Date: 7.5.12