erasing vs deleting



Sometimes when I am off the Internet I Erase Temporary internet files, temp, history and cookies. Then restart in DOS mode and using eraserd, erase my swap file which has no stable upper-lower limits. Then reboot computer enabling my autoexec.bat(if i remember right) to DELETE(dos mode) index.dat etc files from the temporary internet , cookies, temp etc directories.Finally when in Windows(98se) I ERASE unused disk space.
Am I doing anything rediculously wrong or unnecessary here?Thanks! :oops: