There are lots of (freely downloadable) options, one or more that should work for you. Most Windows 7 32-bit programs will run in 64-bit windows and you should not 64-bit code to read SeaDAS hdf files (SeaDAS is 32-bit).
1. The seadas virtual appliance running under VMware player will handle any SeaDAS file
Depending on which files you will need, other options include:
2. You can convert SeaDAS .hdf to hdf5 (.h5) using the h4toh5 program from hdfgroup.org. Last time I checked, there were no windows binaries, in which case
you would need a virtual machine. R has a library to read hdf5 files. This is useful mainly for files such as l3 mapped that use the cyl. equidistant projection.
Other projections may not agree with the implementations used by 3rd party tools.
3. The hdfview utility can load SeaDAS hdf and display metadata, etc. that you may need to properly interpret the files in 3rd party software
4. There are programs that can extract data from l3 binned files to ascii or other formats. Seadas includes readl3bin.c which can be modified to suit, but needs to be linked with hdf libraries. This is very useful if you want to extract data for a few bins from many l3bin files (e.g., to construct a time-series).
has a 32-bit version of Python(x,y).