Both JOcean's and Chino de Oro's solution is a solution. Thanks!
After windows reinstall, no ethernet neither wifi works due to lack of drivers. I visited DELL support page on other computer and got the recommneded drivers. [URL] Put them to USB, then copied to the DELL Precioson. Surprisingly enough, when trying to refresh device drivers and browsing the drivers folder, windows still keeps not recognising any drivers to the laptop. All should be easy like a plain vanilla, but just does not works. Does anyone has a hint to solve this?
Drivers not recognised Precision M4800