I have a samsung NP300E5C that came with windows 8 factory. I work in an auto salvage yard and it was in a vehicle. Weird thing about it though is it has a CoreI3 sticker on the palmrest but its identified as an AMD A6-3420M APU in the BIOS which would be a different model according to samsung support. the hdd has a sticker with the same model as well. perhaps a MB replacement at some point I dont know. I hate the layout of windows 8, so I used the MS dvdtousb tool and imaged a USB with win 7 ult sp1 x64. Deleted the partition with the windows 8 OS during the 7 install noting a recovery partition (which I left intact). the install went on without a hitch and I used the computer for about a week or so when it began to freeze juuuust as the colored segments of the windows logo start to appear over the words "starting windows". I have to force a shutdown then it launches the repair dialogue and if i try a startup repair, it gives the dialogue for an "automatic repair" such as you would see in windows 8..... hmmm. this is never successful and it freezes at the scrolling loading files dialogue. I should mention I am unable to boot from a burned dvd of win 7 ult x64 - I am prompted to press any key to boot from dvd but it hangs on starting windows as well. I can access the bios setup by pressing esc which gives me the boot options menu that includes entering setup but not by f2, and it wont launch samsung recovery via f4. in fact using any of the f keys results in a black page with a blinking cursor x infinity. I also activated windows via daz' loader although i dont recall the specific version (it was at least 2.something). The bios version shown is 02qu Aptio setup utility 2010 AMI Samsung BIOS team U5.4 C2.11.1210 if someone could shed some light down this tunnel I would be much obliged indeed! thanks in advance!