I have bought the upgrade of windows 7 to professional 64 bit system. Since my pc is running the 32 bit system I have to remove the old OS by deleting it on the hard disk. I have 4 partitions to my hard disk and I dont know which to format or delete or what. I have Disk 0 partition 1: System 199.00mb 165.0 system (i think it would be this one?) I have disk 0 partition 2 447.4 gb 410.3 gb primary disk 0 partition 3: recovery 18.1 gb 2.6 gb primary disk 0 partition 4: HP_TOOLS 103.0 mb 91.0 mb primary (i dont think this is the one) Which one do I delete? Or do I delete more then one, and what about the files on local C.