SL400 Base System Device driver missing after upgrading to Win7

[#1]

Symptoms

Hello,

I have an SL400 and upgraded to windows 7. I installed the operating  system and used thinkvantage system update 4.0 to install the drivers. All went well except 1 thing(actually 2) as the Device Managers says there are 2 drivers missing, displayed -->Other devices-->Base System Device(this displayed 2 times one under like 2 drivers are missing).

Diagnosis

SL Systems upgrading to Windows7 

Solution

The Unknown base system device is the Ricoh Card Reader.You can get the driver from the below given link

http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-70413

[#2]

Have similar problem. Have Lenovo Y450 . In device manager --->>>>Other devices I am getting Base System Device error.

Have spent 4 hours but of no use. Can any one Help me get this resolved. Will really appreciate this.

Please mail me  luthra_lokesh@yahoo.co.in

Thanks in advance

Regards

Lokesh Luthra