> unable to use any drop down menu from any site.

Web browser?
Which?
Does it have a "Safe Mode"? Test in there.

> when I opened the Win System tab and tried to look at the M/S version I could not go down the page

How?
Arrow keys? Page keys? Mousewheel? Mouse & click? Mouse & scrollbar arrow?


Wired or wireless mouse? Battery low?

Try a different mouse.