[Linux Mint] No Grub bootloader. Help!

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http://ubuntuforums.org – I installed Mint 13 Cinnamon today. I already have Windows XP installed. Now the problem is that the grub bootloader does not appear. Instead when I start the PC I see "Frequency out of range - 90 K / 59 HZ" on the monitor and after a while Mint loads. I posted this problem on the Mint forums too but no solution yet. Since Mint is basically Ubuntu and Ubuntu has a very vibrant and cooperative community I am posting my problem here in the hope that some one would help me. So kindly help me.:) (Hardware)