I was using Hijack This to delete some spyware on my COMPUTER and think I accidentally deleted a file that is necessary for Windows start-up.  I can't get the computer to start in regular mode or safe mode and it gives me an ERROR message for Explorer every time. Is there anything I can do to fix it short of upgrading the operating system?What version of Windows? If ME or XP you can use System Restore to go back before this faux pas happened.Unfortunately, it's running on Windows 98, so there's no system restore.Can you try a logged startup, then inspect the boot log file to see what is preventing the startup?I tried it, but it didn't load far enough for me to be able to look at the boot log file.Having done that once, the next boot up, boot to the command prompt instead.  Then you can type "edit bootlog.txt" (or boot.log).  You'll then be able to read the log file.The Bootlog says that the file that failed to load is ndis2sup.vxd.  Now that I know what the problem is, what can I do about it?Use floppy disks and the DOS copy command to replace that file with one from a known working PC (with the same version of Windows).  It is also theoretically possible to extract it from the Windows CD, but that can be a bit of a pain in practice, and I always avoid it.  I'm not all that familiar with DOS commands, so although I have the file and know where I want it to go, I KEEP getting the command wrong somehow.  What exactly should I enter to copy a file NAMED ndis2sup.vxd from the floppy drive and put it in C:\Windows\System ?  From the prompt type

copy a:\ndis2sup.vxd c:\windows\system

keep all spaces intact