How to change default installation directory sapinst_instdir TO other drive

Hi,

I am installing ECC 6.0 and have enough space in my disk for data files.

I have alloted 20GB in C: drive which also comprise of Operating System.sapinst_ instdir directory grows more than 10GB and due to lack of space installation fails. How can i change th default sapinst_instdir directiory from C drive to other drive. can i use any software to change partition? ( with OS windows server 2003)

I have also encountered an error at import phase of first job and after changing *.TSK file the installation proceeds. will this cause any serious problem.

regards,

Anand