Nu cred ca merita sa instalezi din nou win. Pentru ca sa-ti faci o partitie noua iti trebuie un program gen "Partition Magic allows you to create, resize and merge partitions on your hard drive without destroying data.
Read more at http://partition-magic.soft32.com/#2fifxTsygXPpupPD.99"
Dar daca ai WIN 7 intra in control panel > administrative tools >computer managment > disk management > c > shrink volume