For the base system issue try THIS driver.
I need help identifying and correcting what I believe is driver problems.  First, I have a Dell 1735 laptop that had the Vista 32 bit OS.  I upgraded to Windows 7, 32 bit system then discovered the computer was 64 bit capable. After much trouble, and helpful advice from this forum, I was able to change the boot sequence in BIOS to boot up on the cd/dvd drive to download from the 64 bit disc. I did a clean install with the 64 bit OS disc which formatted the hard drive.  Afterwards, the Bluetooth mouse, fingerprint reader, Dell webcam,  the button on left side of computer that brings up the status of the wireless network, and none  the Dell factory installed software (expected this one) worked.  I used my reinstall disc’s to install most of the software, however none of the drivers worked.   After much searching and not finding any downloads at Dell that would correct my problems I remembered my granddaughter had a computer just like this one except hers came with the Vista 64 bit OS.  I borrowed her reinstall disc’s and got everything working except the fingerprint reader (her disc was for 32 bit, don’t know how that happened) and one issue that still shows up in the Device Manager.  It is in “other devices” as “Base System Devices”.  I don’t know what it is except when I deleted it from the Device Manager it flagged the speaker device on the task bar and reinstalled it. On the fingerprint reader, I found one download at Dell that apparently was the correct software but it still doesn’t work, however,  it no longer shows up in the Device Manager as a problem .  I am seeking help with these two issues.   
Windows 7 32 bit to 64 bit