How to mount additional Windows partitions in a WUBI installed Ubuntu?

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http://askubuntu.com – I am new to Ubuntu. I was using Windows Vista Ultimate before I came to Ubuntu. Can you give me a solution to discover all my files? I have two partition in Windows: C: and D:\. In D:\, I kept all my files, movies, songs, pictures, books, games, backups & etc. But I cannot find any of these in Ubuntu. In fact I can't even find my D:\. All I found is a folder name "Host" and there I can see all my C:\ files. Please help me. All of my important files are in D:\. I downloaded Ubuntu 12.04 and installed it with WUBI. Is this the cause for not seeing my folders? Should I install Ubuntu (HowTos)