Download the knoppix livecd ISO.
ftp://ftp.gwdg.de/pub/linux/knoppix/KNOPP...10-01-31-EN.iso
Use some CD burning program that can burn iso images to disc as a disc image (like
Free ISO Burner), simply burning that file onto a disc as a single file will not work.
Generally in the program, you'd go to "file" and "open disc image" or "open image" or something and point it to the .iso and it takes care of the rest.
Since it's an OS CD, I suggest burning it at a rather slow speed, like 2x or 4x or 8x, just to make sure there's no errors during burning. Just go read a book or something while it's burning.
When it's done, take the disc out, label it if you want, then restart the malfunctioning computer. When it's first starting up you should see something like "press delete to enter setup", telling you to press a key. Press it, and you'll get into your motherboard settings. There should be one about boot order in there, make sure that the optical (cd/dvd) drive is before/above the harddrive. If not, change them around so it is, but most modern computers will have it already set on that.
Then put the CD you made in the malfunctioning computer, and restart it. If it tells you to press a certain key to boot from CD while it's starting up, press that key.
Then wait for knoppix to startup. You'll get some sort of interface sort of similar to windows, and hopefully you can browse the internet from that CD.
Find the file you want in the harddrive and delete it.
To get back to windows, just tell knoppix to shutdown, and it'll go through a small shutdown sequence, eject the CD, and tell you to take it out. Then you can restart your computer like normal.
