ubuntu install problem

[Vasile Gheorghe]

Hello
My PC has two harddisk. One partition is Windows XP an the other one ... 
I should install Ubuntu but ...
While installing ubuntu and also after install it, all menus begin 
select and change them self from one to other one without a mouse selection.
Its imposibile work in this circumstantances. I have no any viruses!
Please what is to do? Thank you very much