Please capitalize where necessary: you can make your own screen savers out of any bmp, jpg, or gif files located on your computer.
A: You can make your own screen savers out of any BMP, JPG, or GIF files located on your computer.

Q: you are then prompted to pick one of the three board bonus symbols to reveal your initial number of rolls: two, three, or four.

A: You are then prompted to pick one of the three Board Bonus symbols to reveal your initial number of rolls: two, three, or four.

Q: unsure about which type of odc file you have? do you want to know exactly what it is, who created it, and how to open it?
A: Unsure about which type of ODC file you have? Do you want to know exactly what it is, who created it, and how to open it?

Problem: now she needs your help to choose skirts, trousers, blouses
Can you repeat this sentence, but capitalize it?
Answer: Now she needs your help to choose skirts, trousers, blouses

Text: one of them was to sell a secret to state institutions.

Correct capitalization: One of them was to sell a secret to state institutions.

Q: 1350 - the kingdom of ayutthaya formed in the south.
A:
1350 - The kingdom of Ayutthaya formed in the south.