Very Computer

i am a newbie who is trying to go from dos/windows to linux. i need to make
a new partition for linux with out deleting my old one- so i have tried to
shink it using FIPS and partition resizer. i have defragged my disk, but my
unmovable hidden files prevent me from making large enough partitions. what
can i do? please be specific and when in doubt, assume i dont know much.