delete flash:vlan.dat

Switch#delete flash:vlan.dat
Delete filename [vlan.dat]?
Delete flash:vlan.dat? [confirm

erase startup-config

Switch#erase startup-config
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm
[OK]
Erase of nvram: complete
Switch# s
00:04:46: %SYS-7-NV_BLOCK_INIT: Initalized the geometry of nvram

reload

Switch#reload