Three Great Virtues Of A Programmer (http://www.google.com/search?hl=en&lr=&ie=UTF-8&q=Three+Great+Virtues+of+a+Programmer&btnG=Search)
What's the error you see? It's much easier to check if you...

and what's wrong? (ie. does it not compile, or does it not work as you think it should?)

Why did you do that to your program??!
Your previous variant with do {
x.disp_array();
x.get_player1_move();
x.get_player2_move();
x.winner();
} loop and TicTacToe constructor doing...

As far as I can see, you have an int winner() function in TicTacToe class, which returns 1 if the first player has won, 2 if second player has won, 0 if nobody won yet.

end = x.winner() will...

I didn't try to run it, or even compile, but the most obvious issues for me are:

do..while loop in main() doesn't assign any value to end. Perhaps it should have this line:
end = x.winner();
...

Perhaps,

int x,y;

cout << "Enter coordinates for your X: ";
while(true) {
cin >> x;
if ((x>=3) || (x<0))
cout<<endl<<"invalid move. try again with a number from 0 to 2: ";
else...

Be warned that Borland ceased further C++Builder development...
(So Delphi [pascal] or MSVC [C++] would be a better choice to start with)

OK then, ask him what compiler he advices to use (Microsoft's, I guess)

The compiler itself is not enough. You may also need additional files (MFC header files, for example) which are not included...

I guess you'll need Microsoft's compiler, afaik their code (MFC) won't compile by other compilers. The easiest way would be to get Microsoft Visual C++ (but it costs money :))

Can't you ask...