i've lost my linux (correct form)

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i got 2 OS,  MS's and Linux i had them both working and i could chose which 2 work with by lilo (some linux base program that resembles 2 lilo, but not it )   When I've installed a new HDD my "lilo" did something like "stage1....."and got stock i didnt know how 2 work this out with my linux so i've installed my win from CD (so it could work at least)   i knew it will desapear my linux now i need ideas bout get it back   10Q