Posted 19 April 2005 - 04:02 PM
I'd start by running System File Checker. Click Start -> Run and type in "cmd" without the quotes. Then when the black DOS emulator screen pops up, type in "sfc /scannow" without the quotes and see if it can find any missing system files. Give it time to work and have your install disk ready to use if prompted.
If that doesn't help and you need to reinstall the system, you'll have to go into the BIOS and reset the computer to boot from the CD by changing the boot order. Once you've installed the operating system, remember to go back into the BIOS and change the boot order back to where it was. (In other words, make a note of the boot order before you change it.)
With the Windows CD in the drive it should start up by itself. This varies with different types of computers. Getting into the BIOS varies with different computers. In some, you hit delete as the computer is booting. In others, it's F2 or F12 or ctrl-alt-esc. If you have a manual or something that came with your computer, that would be a help.
Another possibility - does the program you downloaded have an undo feature that will let it put everything back where it found it?
Another thing to do would be check your hardware Device Manager to see if you need to reinstall drivers, but I'd try the file checker first. To get to Device Manager, hit the Windows key and the Pause/Break key simultaneously. In XP, it's the "hardware" tab and the "Device Manager" button after you get the System Properties box open.