Dell N5110 problems with installing drivers Win8.1 64-bit

Hi, I've this laptop to repair and I''m facing big trouble to find drivers and possibly to find some hardware issues with it. First I ran diagnostics within setup and found that DVD drive is bricked. I removed it. Also I got BSOD with WHEA_... some message which said that Win has problems with some hardware or drivers. OK, I replaced thermal paste and currently I'm not getting this problem. Realtek FE driver I tried to install couple versions but it says me device cannot start - error code 10. Also there is problem with the Bluetooth adapter driver. What can I do to fix it. Thank you.