Bitlocker is a data encryption that is used by the fancier versions of Vista and 7, and I'm pretty sure that HP doesn't use it. Odd.
Well, yeah, you're most likely going to have to perform a clean install. Try choosing the "custom install" option, and install 7 on the same partition that Vista is on. If it will let you do that, it will save your old files automatically in a folder marked "Windows Old".
"They should rename the team to the Washington Government Sucks. Put Obama on the helmet. Line the entire walls of the stadium with the actual text of the ACA.
Fix their home team score on the board to the debt clock, they can win every game 17,000,000,000,000 to 24. Losing team gets taxed by the IRS 100%, then droned."