In a word
NO
Once its been deleted its gone, no going back i'm afraid.
However there is no reason it cant be sorted, even if it is xp.
But unless you have knowledge of computers/drivers and the installation of these things it might be difficult for you.
My first advise would be ( and i'm assuming you can get online).
Go to windows update
Microsoft Update
and follow the links, if after that your still having problems.
come back and post some more, try to give as much info as possible.
but do one problem at a time.
good luck