You can get an ME start-up disk form here ( assuming you have access to the internet ) Bootdisk.Com - Free Windows Bootdisks, Free DOS boot disk
Start the computer with this disk and attempt a system restore, or fix the master boot record.
When the floppy has finished loading and started your computer you can type HELP. This will give you a list of possible options.
I would suggest trying either SCANREG/RESTORE ( could restore your computer to a point before you installed charter cable) or FIXMBR this will fix your master boot record.