If you too worried to mess with partitioning, you can install WUBI. Wubi is an officially supported Ubuntu installer for Windows users. It can install and uninstall Ubuntu in the same way as any other Windows application. It's simple and safe. Run the download file
If you need any extra help, take a look at the Wubi Guide or ask a question in the Wubi forum.
After the file is downloaded, you have to open it to run the installer. You will find the detailed instructions below. If you need further help, the various support options are listed at the bottom of this page.
If you are using Internet Explorer, you'll be asked whether you want to run or save the file. Choose 'Run' to launch the installer.
Most other browsers, like Firefox, will only ask you to save the file. Click 'Save' and then double-click the downloaded file to launch the installer.
If a security message like this appears, click 'Continue' to proceed with the installation.
To install Ubuntu, all you need to do is choose your username and password. Please note that you have to enter your password twice to make sure you typed it correctly.
After choosing your password, click 'Install'. The files will be downloaded and installed automatically.
Wait until Ubuntu is downloaded and installed. Please note that the whole process can take a while – the downloaded file size is 700MB
When the installation is complete, you will be prompted to restart your computer. Click 'Finish' to restart.
After your computer restarts, choose 'Ubuntu' from the boot menu.