Latitude E6420 Can't find some driver!

Hi, I think I found a solution to one of your problems, namely the mass storage controller

for windows 7

it is

Hard-Drive - O2Micro-_OZ600XXX-Memory-Car_A01_R300787.exe

hier is the link

http://www.dell.com/support/drivers/us/en/555/GetDriver/OtherFileFormats/Product/latitude-e6420?driverId=KC9W0&FileId=2731102815

Broadcom USH is the security driver.  It will either be under Control Vault, Security, or Dell Data Protection.  You have to may have to install the firmware first.