DISK MEMORY IS GETTING FULL

Hi

I am using SAP IDES on windows server 2003,oracle database for sap , installed windows 2007 and windows server 2004 on same hard disk.

On D drive i have installed SAP IDES ,but the disk space is filled .By disk clean up i am getting only 1gb.

Now what can i do.

PLEASE HELP ME WITH YOUR VALUABLE IDEAS.