Arturito.net

Sometime ago I bought this  model of Sony Vaio which originally came with Windows Vista installed.  Since it is not my favorite OS I partitioned , formatted disk and installed Windows 7. I managed to get most of the drivers from sony vaio website http://support.vaio.sony.eu/computing/vaio/downloads/updates/index.aspx?l=en_GB&m=VGN-NW11S_S&os=10
There was only one device which didn’t install – it was memory stick card reader and writer. (Device Manager marked “System Base Device”  with yellow exclamation mark) I found this driver which worked for me:
http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNFW378JB&upd_id=4315&os_id=34
The installation is in Spanish though the download is from US mirror (????) and it says it is for VGN-FW378J/B. But I can assure you the driver works fine on NW11S.  You can also google for the file RIDMSC-00165677-64.EXE

Good Luck!