First, a minor point just to reduce confusion, a disk partition is neither a "wall" nor a "divider" nor a "screen", nor is it described as if it were; for example, one doesn't "get around" a disk partition and things aren't "behind" a partition. In the case of a disk partition, partition means "segment", or "portion" - like a slice of pie (even though it isn't shaped like one). Files are ON partitions, not behind them. Larger, non-PC computers often use partitions very differently than Windows does, but for PCs every disk has at least one partition. For the boot device, that partition will be "C:". Your boot disk has two partitions - C: and D:.
If you have an upgrade version of windows on DVD that requires proof of ownership of a previous version, and you don't have windows presently installed, then recover the system using the recovery partition. Depending on which HP you have it will be F11 or some other key during boot; consult your docs. Once you have windows (32-bit) installed & running on drive C: as usual, then do the installation of the x64 version. It will see windows on C: as satisfying the previous-version requirement.
The recovery partition, D: in your case, does not contain an installed runnable copy of windows; it contains the files that are used to install windows. Do not attempt to use it as a source of drivers or anything else. You should consider that partition to be a black box. And certainly don't change its security settings.
As for auditing, that is a completely unrelated topic that I venture to say will be of no use to you.