Only SDM 2.5 is supported on : Microsoft Windows Vista (Business Edition)
Make sure you stick to the release notes for the java version, the browser version.
http://www.cisco.com/en/US/docs/routers/access/cisco_router_and_security_device_manager/software/release/notes/SDMr25.html#wp35444
You can also try to install SDM on the router (copy over TFTP the files to the router's flash) and then just access it from your browser by pointing it to the ip address of the router.
The files to copy are on the above link :
Table 4 Cisco SDM File List