reinstalling GRUB, tripleboot, / in LVM

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http://forums.fedoraforum.org – HI! I have a problem... I have boot loader in sda1 Win7 in sda2 WinXP in sda3 (and these are like first partitions) next in sda4 (sda4 is LVM) are sda5 (data) and sda6 is linux partition in sda6 is root directory ( / ) and "swap" xD when I installed WinXP my multiboot broke... how can I reinstall my GRUB in sda1? here are some methods... like (grub-install /dev/sda) but neither option works... can you help me? have you any more questions? oh... I have fedora11 :) (HowTos)