Rename command.com (as you mentioned above) to command.old or somthing.
Do the same with the other file you linked...
As for the writing VIRUS...
Then when you posted the other thread, your browser was closed? Because in that topic it said VIRUS and not V I R U S.... [size=1](I allways get a bit suspicious when someone writes a line saying "I can't write 'virus', because then my program closes" but I won't press too hard on the matter...)[/size]
When in safemode, how about creating a new account, which is a poweruser (so you can install things)...
Then go into the default users dir of Documents And Settings, and remove everything from the startup folder...
This should limit how many programs your new user will have running at startup...
Also try to download msconfig, (There's a thread about it on this board somewhere), and uncheck anything that looks or sounds suspicious... (This when you're using the new account)
After that, restart, and try to install the diff programs suggested above...
Hope this helps