If you have a dual-boot system:
If you just temporarily don't want to use 2K, just use “sys c:” to transfer the system again to drive C where 98 is installed, then the multi-boot menu will no longer appear?”. (You can also change the default boot time in the “c:\boot.ini” file to “0” or “-1”; when you need it later, just change it back to a positive value.)
If you want to delete 2K completely, then under DOS you also need to use related software (such as PQmagic) to delete the NTFS partition where 2K is located; or in 98 (you can also boot directly from the CD) run the 2K installer, and after it finishes copying the temporary files and restarts, choose “new installation”; when it prompts you to choose a partition, delete the original partition where 2K is installed, then exit.