We have used a single PC for several requirements due to limited financial ability. It had Windows 2003 Server SP2 as OS and we used both ISA 2004 (latest SP) & SQL Server 2000 SP3 on it. Recently we've managed to get another new PC to install SQL Server to run alone & uninstalled the SQL Server from that old PC. New PC is all OK now, but after complete uninstallation and several reboots even, SQL Server on the old PC is still using lot of system memory, approx 1.2GB. How can we remove unnecessary SQL instances from that old PC and free up the memory?