It's part of the web update program TODO, you used "Express Install" on the CD didn't you?
runupd.exe - What is the runupd.exe from Gigabyte? (id:104798)
Runupd.exe process | What is Runupd.exe file?
I have never installed the drivers like that, or programs from the CD using Express, but I'd image you should find Gigabyte Update or Web update in your add/remove programs and should be able to uninstall it from there.
If you can't, or would rather just disable it, try this program and see if it shows in there or not. Or there may be a normal "uninstaller" file located in the program directory Program Files\Gigabyte\UpdManager\ or Program Files\GIGABYTE\GBTUpd
Startup CPL, this will install into your Control Panel, uncheck or delete any item you want removed from startup
If you can't figure out how to stop it from startup, or remove it, let me know and I can install it in a virtual machine and figure it out for you and let you know how to remove/disable it.