QUES: If your PC is unable to smoothly coexist with Windows 10 or is slowing down because of upgrade to the new OS disable visual effects to give it a helping hand

correct the punctuation.

CORRECTED: If your PC is unable to smoothly coexist with Windows 10 or is slowing down because of upgrade to the new OS, disable visual effects to give it a helping hand.

QUES: While good for TV the Beam comes alive when you feed it with some good music

correct the punctuation.

CORRECTED: While good for TV, the Beam comes alive when you feed it with some good music.

QUES: Signs Letters without light

correct the punctuation.

CORRECTED:
Signs / Letters without light