To help you you need to post details as many as possible. (When do they appear, what OS, when the first time...) After the BIOS beeps one time it's finished. Everything later affects the bootloader / OS I guess they come from cdshell.ini. Every pro would suggest (when a virus / malware is suspected) to make a clean install of the OS with a original ISO / CD / DVD after you have backuped your data.