Currently I have windows7. I have only one partition , Local Disk (C:) used space: 448gb and free space 482gb, File system NTFS. Its possible to install Ubuntu but to keep all my data I don't wana lose the data.
Yes, it is possible. Just shorten your partition, create a new one, and move your data there. Or if you want to keep Windows 7 (which I recomend you, at lest a week till Ubuntu works fine), just don't erase the windows partition while installing Ubuntu.
While installing, create 2 partitions: 1 ext4 for Ubuntu, and 1 swap (with aproximately the half of your RAM). It's very important that you select manual partitioning or something like that, in the Ubuntu installation.
Your disk should be for example like this:
400 GB Windwos 7 500 GB Your DATA 8 GB (half of your RAM) SWAP 92 (the rest) EXT4 (UBUNTU)