I have a Thomson freeview, took me a good three months to get to grips with it but now I fine. If mine freezes I find the best thing is to take the plug out of the wall, count to ten and then put it back, works every time for me.
I have two numbers for help to talk you through problems
08444 159159 AND 0208 977 6097 but its the 08444 number that actually talks you thru it.
Hope this helps, took me almost a year to get these numbers !
Dee