Exactly what is the device?
Most computers have only VGA outputs, not inputs.
If you've miscommunicated the input/output requirements, you might consider putting a very inexpensive computer at the location of the device and doing the video connection to your main computer using X-windows or some other remote display protocol.
Edited to add: StarTech is another supplier of VGA-over-Ethernet hardware, with units typically costing $150 to $300. They're even available from Sears
viewing it would be directly on a display, though, not in a browser.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped