You need to break off from that prior to finishing House's second or third mission - it's the mission that, upon completion, you get a slew of 'you've failed this quest' warnings.
If you've already saved the Prez from assassination, you're stuck on the Wild Card route. Has my killing spree screwed any chance of completing the game? I got most of the way through the House Always Wins missions, Wild Card missions, and have saved the President from assassination.
In addition, Quest Diagnostics Regional and Esoteric Reference Laboratories are accredited by the College of American Pathologists. I cannot find the main lady (can't remember name) at the Hoover Dam, who I thought would be the obvious point of contact after killing all the nasty folk. Main File - Just Assorted Mods 4.1j - Highly configurable set of new modern features such as a quick loot menu, dynamic crosshair, sprinting, and more. All Quest Diagnostics testing locations are appropriately licensed/certified under the Clinical Laboratory Improvement Amendments of 1988 (CLIA 88) and as required by certain State laboratory licensure programs. I assumed the NCR would be quite pleased and want to continue using my services but I can't find anyone to give me another main quest mission.
Unfortunately, in doing all of this, I seem to have reached a point where there are no more possible main quest paths left.
Due to becoming a little bored after 70 odd hours of playing I've gone and wasted all Legion folk at The Fort, killed Mr House, blown up the Brotherhood bunker, and decided I didn't like Yes Man so shot his cheeky little face off. I've been siding with the NCR all the way through my campaign.