1 Windows Partiton and 2 Ubuntu partition Help

[Dan B]

I have recently messed up big time and erased the ubuntu partition
completely without messing with grub. The "No Ubuntu Partition Grub Rescue"
command up, so I bypassed this by installing Ubuntu 9.10 64 bit again but
this copy of 9.10 was being really glitchy for some reason. I tried to
install ubuntu again to overwite the first Ubuntu partition but I messed up
and it made a second Ubuntu partion (three partitions total). If I delete
the first partition of Ubuntu (the glitchy one) will it mess up my grub? If
it will, is there a way to keep my good Ubuntu partition without getting out
the Windows 7 cds? I really like Ubuntu I just messed up with trying some
DIY technique. Thanks so much in advance.
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