Just for the record, I'd avoid any driver updater softwares like the plague. They have a notorious habit of installing incorrect or outright inappropriate drivers. Myself and a few others on here help with BSOD posts and quite often driver updater software can be behind it.
Just stick to downloading straight from the manufacturers website and if you have installed a driver updater software, personally I'd uninstall it and not use it. Fortunate thing is Driver Booster, whilst still just as bad, does usually run a system restore first, so at least it's recoverable.
So have you confirmed that it is one slot regardless as to what stick it is in?
If so, you may want to inspect your CPU / Socket for bent pins for example, or the pressure from your CPU cooler to the CPU as this can cause RAM slots to fault