There're a few reasons why the symbols are not shown.
First, you're not using MetaTrader from
Alpari. If you aren't, download one from
Alpari website. You can't use Alpari's data with non-alpari terminal because of timezone difference. Installing a fresh copy to new location will solve weird problems.
Second, symbols set is missing. If it is, download the attached forex.set file and save it to
..\MetaTrader 4\symbolsets\. In Market Watch window, right click any pair, go to Sets > Forex, and restart the terminal.
Third, my guess, your metatrader never goes online to update the symbols.
Happy trading!