HT4718 if I reinstall Lion will I have to partition the HD again?

My partition drive permissions is not letting me acces the drive and when I try to change the permissions it says custom and won't let me change it to anything else. I have tried to fix the permissions in Disk Utilitiy but still nothing. So I figured I would just reinstall lion and hope that it will fix it.

Installing Lion won't affect any of your applications or data, unless something goes wrong. Nevertheless, you do need to make at least one full backup before you install it. In fact, you need to do that anyway, whether you install Lion or not. Any data you don't back up will inevitably be lost, sooner or later.
Applications that were created for PowerPC Macs only, such as Quicken 2007 and Office 2004, won't work under Lion.
Lion is at least as stable and usable as any other Mac OS version, provided you don't try to run incompatible software. The only safe way to find out whether it will work well for you is to copy your internal disk to an external one and install Lion on that. If you don't like it, all you have to do is reboot.

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