So last week I recieved my brand new HP Envy 15, with a Core i5 540m (2.5-3.3ghz) Ati Radeon 5830, 4gigs of DDR3 ram, and a 500gb HDD. (Of course running Windows 7 Home Premium 64bit.) And everything was running awesomely- Until yesterday when I went to turn it on and when it got to the login screen everything on screen was gigantic, and my keyboard and touchpad were unresponsive. I tried using a usb keyboard and still no luck. Booting into safemode yeilds the same results, even without networking. Yet when booted it up disabling driver signiture enforcement, it worked fine, except everything was slow and my sound didnt work. Is there any way I can boot up regularly again and get my sound working?