Below is the Technical Specifications link for Tableau Desktop and Server .
Please correlate our system configuration with those supported platforms.
Hope it helps!!!!
Hi Varun --
It would also be helpful if you posted some screenshots of the problem or even an example (packaged) workbook that people here could play with. Your question description isn't really specific enough for anyone to act on.
Are you sure the XP and 7 machines are running the same screen resolution?