Ubuntu 12.04 installed successfully, but my XP is not bootingup though it is showing in the booting options

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http://askubuntu.com – I am new to Ubuntu and also Unix/Linux commands. I have primary partition where my XP is sitting and I have on extended partition where my XP data is sitting, and then I have some 50GB un-partitioned free space. I inserted the Ubuntu Live CD of 12.04 and choose the manually select partition and install Ubuntu. In that further steps I created a swap area 5GB and remaining 45 GB as another primary partition in the root (/ ) where I installed the Ubuntu 12.04 So, the installation was successful, now when I restarted the system on the multi-boot window, XP on SDA1 is also showing-up apart from oth (HowTos)