I have a P.C with Win. 98, I ran a Virus scan (Norton Sys 2000), and it gave me the message: "startup.exe and command.com" are missing or corrupted"; it did not give me any ideas on how to repair them or replace them, any help on where can I get this files ?

Are you able to boot your computer up normally into Win 98? You need to tell us more.

You got that message from Norton 2000? Or you got the message as you were booting up? Also please post the exact message you are getting!!

O.K here it is: I bought Norton SystemWorks2000, the box comes with 3 Emergency disks, according to the book I can check my P.C for any Viruses before I do the installation by booting up from disk#1 wich gives me a menu from which I can select "Antivirus",(all this from the DOS prompt), after it scanned the C:\ drive (8 min maybe)I received the message :command.com file is missing or corrupt (and then on the line below) startup.exe is missing or corrupt; after that it prompted me to my A:\ drive and that was it, I reestarted the P.C and went on with my business. The reason I ran the test was because mu P.C was acting "weird"(slow performance,unknown files placed in "My Documents" folders, mouse pointer acting strange, and too many freezing stages) So.......Poltergeist or just a piece of S.... system?

Copy command.com from your startup disk to C:\ and see if it is still corrupt?