QUES: SystemBytes Win XP 2015 is rogue security software that will try to convince you that your computer is full of threats

correct the punctuation.

CORRECTED: SystemBytes Win XP 2015 is rogue security software that will try to convince you that your computer is full of threats.

QUES: Unintentional Formatting Sometime while toying with the settings of the Panasonic SDHC memory card users end up formatting the card without having any proper backup of the files and folders

correct the punctuation.

CORRECTED: Unintentional Formatting: Sometime while toying with the settings of the Panasonic SDHC memory card users end up formatting the card, without having any proper backup of the files and folders.

QUES: The hotel offers a gym and a fitness centre to ensure guests keep fit

correct the punctuation.

CORRECTED:
The hotel offers a gym and a fitness centre to ensure guests keep fit.