Need help with MSI laptop hardware

[ollie2k13]

Hey guys so basically i unscrewed my laptop and blunted one of the heatsink screws
i have a photo:
https://gyazo.com/c9c23c38281df81aac1a7bdc8346b9ad

now i need help trying to get the screw out now since i blunted it so any good screwdriver for a screw
this size or any tips would help.

also when i have the screw out finally and hopefully does anyone have a good link to a website to find
identical mini screws to replace the heatsink.

last part sorry to annoy does anyone know any super cooling thermal paste for cpu and gpu after i get

hope someone can tell me replies to all 3 would appreciate it a lot

 

[ollie2k13]

might be able to manage it but dont have mole grips

 

[ollie2k13]

i think i will find a way all i need to do is undo the screw and then my next step is actually finding a replacement which im not entirely sure where to find a matching one for my msi laptop