The readme.txt file distributed with the Quartus® II software version 7.2 states in the Software Requirements section that the software supports 32-bit and 64-bit Windows Vista.
However, the SOPC Builder and Nios® II Integrated Development Environment (IDE) included with the Quartus II software version 7.2 are not supported in Windows Vista. Windows Vista support for these tools is planned for next release of the software.
The readme_corrections.txt file lists the updated operating system support for the Quartus II software and the Nios II Embedded Design Suite.