try Loading THIS driver.
I recently installed Windows 7 on my Inspiron 1526. All the drivers were installed correctly but the 'Base System Device' driver couldn't be installed. I tried the 'Search Automatically for the updated driver software' option but no driver could be found. My research says that this driver is specific to Intel based machines, mine is an AMD based machine. Let me know if I am correct. If not then where can I find the 'Base System Device' driver?
Base System Device drivers for Inspiron 1526