The best option is to normalize all Likert variables, including those with 5-points. You can find the option in Descriptive statistics in SPSS. If I am correct: Analyze - Descriptives - ... And one of the first three. Tick the box 'save as standardized values' (z scores). All variables will be transformed in a way that they will be ranged from -1 to 1.

Best,

Eugene

Why do you have to change the scoring? This could affect the reliability and validity of the scale, as well as your ability to compare its results to earlier versions of the scale.

Normalization (z scores) does not impact reliability. That's why I would suggest Anoop to go for it.

Most measures of reliability (e.g., Cronbach's alpha) and validity (e.g., convergent validity) are based on correlations, so they are already inherently normalized.

Thanks a lot sir

What is the reason of changing the scale?

I don't think to change the score. If it is adopted, would affect the earlier version of instrument. 

changing of scale will lead misinterpretation of results.