timer differences across different computers

I have constructed a timer:

Timer timer =new Timer(1,this);

and it works fine on most computers I have tried it on (they were all XP), but I am working on it on a new computer (vista 64-bit) and the timer goes way too fast so that i had to make the speed 15. Is this normal or is there something I can do to help this without making two versions of the program?

[447 byte] By [randomballoona] at [2007-11-27 7:51:25]