How do I delete system

I installed the two systems how to delete one? With my C drive mounted on how to do?
When I boot according to F1 in order to log on how to abolish?

1 disc format C re-2 system 3 OK, what would also like to re-direct sub-3 system can be installed by the time he will give you re-format it, delete the use of unclean FDISK will be C:divided into two zones, which will be assigned to just two systems in two sites (there is a certain degree of technical difficulty).Into the system, under the observation of the C disk file, there should be 2 windows (the other May be called windows0), to find out which one it is normal to abnormal direct delete, and then run msconfig in the importation of no use to start menu to delete, not on the electoral system, a two-
(although it is stealing But I hope to help you, oh ~) into your computer COMS will remove the 3.5 floppy boot to resolve the issue of f1 by the