On my Windows XP Professional ver 2002 Service pack 3 the file " ndis.sys " is missing from the c:\windows\system32\drivers folder. I have tried to copy the file from C:\WINDOWS\ServicePackFiles folder but this did not help, so I deleted the new file in safe mode. Is there any way to download the correct file from microsoft. I think an anti virus programme deleted the file on me.
I think this missing file is causing all my network adapters to display the yellow triangle.