In-built mic not working after installation of windows 7 on my hp nc8430

So I installed windows 7 on my laptop which originally was running windows xp (hp compaq nc8430) and it turns out that the inbuilt mic is not working and it won't even recognise the SD card that i insert in the card slot. Everything was working perfectly before the installation. I checked the audio devices in control panel and it says the microphone is not plugged in. Also the screen resolution is weird, it won't go above 1024x768, everything is too big for my liking.
Could someone help me out please? Thanks in advance.

Are you using Boot Camp to attempt to install Windows?
https://www.apple.com/support/bootcamp/

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Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
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In-built mic not working after installation of windows 7 on my hp nc8430

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