Since the problem started when you installed chipset drivers it's most likely a bad driver. Try to boot in safe mode and do a system restore to a date before you installed the drivers.
Did you install the drivers from the CD that came with the motherboard? They're most likely outdated already, download the latest drivers from the Gigabyte website instead. If you were already using latest drivers, try with an older drivers instead. Bottom line, try with a different version of the chipset drivers and see if it's more stable.
Flashing BIOS to latest update and also resetting BIOS to factory default might help too.