Why i can't erase the hd in disk utility

i'm using os x lion and can't erase my hd using disk utility, what i need to do is create a bootcamp partition but the system won't let me unless i first erase my hd, recover using time machine and then try again the bootcamp partition, any help?
thx!

Your hard disk is probably fragmented. You have several options:
1. Use a 3rd party disk defragmenter like idfrag and defragment your drive (may or may not work)
2. Go to disk utility and repair the volume (works for some)
3. Do a complete reinstall (like you said)
I'm sorry, but I don't really know how to wipe it. Try some Google searches or take it to an apple store to get some proffesional help. You could always try the other two options though.
Good luck, sorry I can't help much,
NWB1

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