QUES: We are up against big American corporations with plenty of capital and yet we have still managed to develop a better product

correct the punctuation.

CORRECTED: We are up against big American corporations with plenty of capital, and yet we have still managed to develop a better product.

QUES: As malware is becoming more complex and more advanced antivirus software packages are becoming more elaborate

correct the punctuation.

CORRECTED: As malware is becoming more complex and more advanced, antivirus software packages are becoming more elaborate.

QUES: Sire I would not flatter myself to think I could surpass them had I not a distinct advantage

correct the punctuation.

CORRECTED:
Sire, I would not flatter myself to think I could surpass them had I not a distinct advantage.