Once you have installed HashTab, just right click on any file. On Windows, select Properties and you will see a new "File Hashes" tab. "File Hashes" displays all the configured hashes for the file.
You can customize which hashes are calculated and displayed. You can hash other files for comparison. You can also paste in hash text so you don't go cross-eyed trying to compare hashes. HashTab supports the following hash functions: Adler32, CRC32, MD2, MD4, MD5, RIPEMD(128,256,320), SHA-1,256,384,512, Tiger, and Whirlpool. Coming soon, MD6, eDonkey/eMule