Apart from your NVIDIA graphiccard everything of these hardware is probably supported very well out-of-the-box. For you graphiccard you will need NVIDIAs proprietary drivers, otherwise the 2D and 3D acceleration will be pretty bad. You can follow this guide here
to install it (after you completed your Fedora 15 installation).
I recommend that you save your more important data on external media first before you install Linux. It's usually not necessary, but nevertheless safer. And it makes of course always sense to have your important data on more than one storage medium stored, even if you only used windows.
In case if you don't have unpartitioned space on your harddisk, you will have to resize or remove partitions. There are Windows programs where you can resize partitions, but you can also do this during Linux installation. I don't know any of such windows programs.
During linux installation you can choose to automatically create linux partitions, and if necessary to resize existing partitions. I personally prefer to make manual partitions setups, because I want a setup without LVM. Fedoras installer uses LVM setup by default. This has in few cases advantages, but it can sometimes make things a bit more complicated for example if you want to use more than one linux on your system. I really don't have much experience with LVM setups, maybe I exaggerate.
In case if you want to try a manual partition setup (automatical setup is easier):
- choose the appropriate option in the Fedora installer (manual partition setup)
- your Linux partitions should be after your Windows partitions
- resize existing partitions if necessary and make sure that there is enough free space on them
- create a partition with mountpoint "/" and ext4 type, size 9 GB or more
- create a swap type partition 2 GB or a bit more (without mountpoint)
- use the rest of the free space for your home partition (mountpoint "/home"), there is all your user data (documents, media etc.) stored (partition type for example ext4)
- you can only have up to 4 primary partitions on one harddisk, your fourth should be a an extended partition, which can contain up to 8 logical partitions (if you need more than 4 partition)