First of all, I don't like correcting people, not only, but also for the reason that I might do things wrong, too.
Anyway I think it's important to know something about ecyclopaedic style. Not that I was the best at formal English around the place, but let me give some hints to achieve a more formal style in your Wikipedia articles:
Don't use personal sentences like
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Some people are used, when installing a program, to click next, next, next, '''without''' actually reading what they are accepting, what happens is that they think the sponsor is installed without they allowing but it is, as you can see in the screenshot on your right side, you can choose whether to install the sponsor or not.
If you need to use a personal sentence, use "one":
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Some people are used, when installing a program, to click next, next, next, '''without''' actually reading what they are accepting, what happens is that they think the sponsor is installed without they allowing but it is, as one can see in the screenshot on the right side, one can choose whether to install the sponsor or not.
But that isn't very good English either. It's better you try to change the sentece so that it's not needed to use personal forms:
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Some people are used, when installing a program, to click next, next, next, '''without''' actually reading what they are accepting, what happens is that they think the sponsor is installed without they allowing but it is, as shown in the screenshot to the right, there is the option to choose whether to install the sponsor or not.
Punctuation! Make the sentences have sense, don't try to enlarge sentences if you can clearly split ideas:
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Some people are used, when installing a program, to click next, next, next, '''without''' actually reading what they are accepting. What happens is that they think the sponsor is installed without they allowing, but it is, as shown in the screenshot to the right, there is the option to choose whether to install the sponsor or not.
(I'm not very good at punctuation, please correct any mistakes)
And avoid using infrormal expressions where possible and be as accurate as possible:
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Some people are used, when installing software, to disregardedly accept agreements without reading them. This mistakenly causes them to think the sponsor is installed without user's permission. However, as shown in the screenshot to the right, there is the option to choose whether to install the sponsor or not.
Please, correct/improve this text for it to be a style model for all wiki-volunteers who would like to help us in building up a nice MP! article while learning how to write other ones. Thanks