Have a look at this: Free Hex Editor Neo - Freeware Binary File Editing Software Utility Download this Tool. It works with Vista and is straight forward to use, although, like many commercial software programs, certain features are not available in the free version. It does not have a calculator, but instead links to the one that is included with Vista, which can be configured to operate in 'Scientific' mode by clicking the relevant option under 'View'.
There is a comprehensive help system available, and there is also a forum where further advice on using this program can be found.
4 x 4GB DDR3-1600 Corsair Vengeance CMZ8GX3M2A1600C9B (16GB)
Graphics card(s)
MSI GeForce GTX770 Gaming OC 2GB
Sound Card
Realtek High Definition on board solution (ALC 898)
Monitor(s) Displays
ViewSonic VA1912w Widescreen
Screen Resolution
1440x900
Hard Drives
OCZ Agility 3 120GB SATA III x2 (RAID 0)
Samsung HD501LJ 500GB SATA II x2
Hitachi HDS721010CLA332 1TB SATA II
Iomega 1.5TB Ext USB 2.0
WD 2.0TB Ext USB 3.0