Were here to help but do one thing at a time. Posting info about system, Distro, Version, Kernel version, Gui interface and Version is a start. The following commands for info like:
/sbin/lspci -v ( for a list of hardware on system )
/sbin/lsmod ( List loaded modules )
/sbin/fdisk -l ( list harddrives seen and partitions on them )
uname -r ( kernel version that is running )
These files contain configuration and posting their contents for specfic questions help.
/etc/fstab ( list of partitions that are mounted and where )
/etc/modprobe.conf ( list of modules that may load here, This will not list all )
/etc/X11/xorg.conf ( config for X server, Mouse, Monitor, Video Res and more )
Many commands and files have docs on the install already. using the man command list options.
Using the search tool here helps alot on many items and some may even be distro specific. Going to http://www.google.com/linux
is another great source of search info.
It will take time but ask lots of questions, be as specific as possible, Do lots of searches, and just do random reading in the forum.
What app you using for downloading. Usually there is a properties or preferences options that can show where things go. Usually many default right to the users home directory.