When tryint to use the recovery partition of the HP pavilion dv7 the automated process first wipes the "C" hard drive. This is why you are getting the Bootmgr missing message... that file has been erased along with everything else on your "C" hard drive.
There is apparently a glitch when trying to load the operating system from the partition. That glitch results in the "error 1002".
I am in the process of trying to get HP to react to this problem, which is a manufacturing defect, either with the software (probably) or hardware (though I can't see how a hardware problem could cause this, I also can't rule it out as a possibility).
There is nothing you can do except get a CD or DVD that can boot your system. Even if you had made the recovery CD as HP recommends, I have seen MANY instances on the internet where these recovery CDs are also failing.
While I am going through the process of forcing HP to do something I will likely order their recovery CD package to get the computer up and running... but I have also run into posts about the HP recovery CDs failing in this same manner.
Good luck.
Whether or not you get your laptop to work again, you should file an FTC complaint and maybe get a recall or company-paid-for-fix for all the Pavilion dv7 and dv6 notebook owners that are still out there struggling with this problem or yet to struggle with
this problem.
Michael Polidori