The word "software" is an uncountable noun in the english language, which means that it does not accept the indefinite article "a". To correct this, either remove the article, or, append "piece of" after the article. The word piece, being countable, allows this to happen.
The word "software" is an uncountable noun in the english language, which means that it does not accept the indefinite article "a". To correct this, either remove the article, or, append "piece of" after the article. The word piece, being countable, allows this to happen.
For further reading, see here.
I have also replaced "from Windows" to "in Windows", since that makes more sense.