My hard disk crashed and I had to reinstall Ubuntu. I dual booted it using Wubi and I installed it in C: partition. When I boot into Ubuntu, I can't see my partition (The partition where Windows is installed) but I can see my second partition, D:. Do I need to mount the partition?
The Windows partition where you installed Wubi is available as /host within Ubuntu (Places > Computer > File System > Host) All the other partitions will be available under Places > Removable Media
See WUBI FAQ for additional tips.