Hay i need to fine out how i can re-size my partitions on my xp pc?

so i made my pc myself & then i did the partitions size was just fine at the time but a few if my fave games had a mandatory update where you cod not play then from other partitions any more so i had to move them & now my mane partition is to full to run right & i do not want to reformat my pc & magic partition is like $50 about & i really only need it 1 time to re-size my partitions so my game will play right it wood be better if it was free tho ty for the help i do not have much $$$ for thinks like that