Seatools seems to install and runs without errors on Windows 7 x64.

On my machine at least, only the generic short test was available.  The other tests were all not available.

A likely 64-bit bug is that Seatools swaps characters in each pair of characters in the serial number it reports for your drive. This is true both in the test logs and in the on-screen reporting of the drive serial number. 

For instance if your serial number is X6P556D4   Seatools shows it as 6X5P654D

I had a Barracuda LP die with the click of death and I uploaded the log from Seatools into the case I filed with Seagate support.  Support couldn't find the drive serial number in their database - which led me down the path of finding this problem.  Other utilities (For instance Intel Matrix Storage Manager)  report the drive's serial number correctly.  I'd guess Seatools is swapping bytes incorrectly under the 64 bit operating system. 

--We turn on ideas. Release the hounds.

Give a hoot. Backup your data on a second storage media.

Here's the actual file produced by Seatools (Version 1.2.0.0), with the last two digits of my drive serial number concealed.  The correct serial number is 6XW030**

X60W03**.log

--------------- SeaTools for Windows v1.2.0.0 ---------------
9/6/2009 4:29:46 PM
Model: ST31500541AS
Serial Number: X60W03**

Firmware Revision: CC32
Test Unavailable - Test Unavailable 9/6/2009 4:29:46 PM
Test Unavailable - Test Unavailable 10/28/2009 10:39:39 PM
Test Unavailable - Test Unavailable 10/28/2009 10:39:46 PM
Short Generic - Started 10/28/2009 10:39:58 PM
Short Generic - FAIL 10/28/2009 10:48:06 PM