Problem: Lenovo driver page do not list Base System Device drivers on drivers list
Unknown driver on Lenovo ThinkPad SL500, 2746-E5G was Ricoh SD/MMC Host Controller
and Memory stick Bus Adapter,
they can be found on separate web page from the driver list:
Also, installation will not be enough,
exe file (6ax102ww) should be unpacked (right-click on exe file and unzipp or unrar) and via Device manager search for drivers in subfolders:
MS and SDMMC because with selected option to search subfolders - windows will report that there are no drivers available!
User must point to exact location for the drivers.