New to Linux, this is what is stopping me from using it

[Moltke]

Hi [member=7194]LinuxTest[/member]

In win 7 I am using "set custom text size (DPI) of 150%

As someone has already said this doesn't seem possible at the moment on LL

I want to set:

-  key "end" as a mute key

-  key "pgdn" as "volume down"

-  "pgup" as "volume up"

This post might be of some help

a. I would like to install Pot player instead of VCL

I like pot player too, unfortunately it's not available on Linux and last time I checked it wasn't supported on wine either
I use QMplay2 and I like it better than vlc. You can read more on it here 

I would like to use a custom mouse pointer. I wonder if I could use same custom mouse pointer I use in win 7

On this page you might find something that fits your tastes. I think there's even a Windows 7 theme.

In win 7 there is a "restore system image" option so I can just return the whole system to the version where everything worked fine

Someone has already told you about systemback which is preinstalled on LL and it works great. Simply click on your home key on keyborard and type systemback in the searchbox, it is very easy to use, though it's not the same as restore system on windows since it doesn't use shadow copies, but still a great app. Hope this helps!