It sounds like you did not do a clean install if Office is still on C.
You can "totally clear" the drive by going into Diskpart application early in the Windows installation when you come to the language choice screen. Hit Shift F10 at that point.
What does "to task 29ing my old htc touch pro 2" mean?
The commands to clean and format a system with a single physical hard drive would be:
Type in the following commands one by one, followed by the Enter key to create a partition (text in brackets are comments only):
list disk (to show the ID number of the hard disk to partition, normally Disk 0)
select disk 0 (change 0 to another number if applicable)
create partition primary size=80000 (creates a partition with 80 GB space; to use the entire disk as one partition, omit the “size=value” parameter switch; use a similar command to create more partitions if needed or create in Windows 7 after installation)
select partition 1
format fs=ntfs quick
Type exit at command prompt to close Command Prompt window.
Continue Windows 7 installation as usual. Remember to just highlight and select the partition just created when you come to the partition screen.