Parsing numbers and dates is cumbersome - the same line of code may produce different results on different systems.

useful debugging information

• Globalization.CultureInfo.CurrentCulture.Name
• Globalization.CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator
• Globalization.CultureInfo.CurrentCulture.DateTimeFormat.DateSeparator

check these settings

• regional and language settings of code executing account (Control Panel > Region and Language)
• if necessary apply regional and language settings to reserved accounts (LOCAL SERVICE, NETWORK) by "Control Panel" > "Region and Language" > Administrative tab > "Copy settings..." button > check "Welcome screen and system accounts"