Any help can be appreciated greatly. Are there any viruses out there that can change the way you view websites? I was checking my grade on a teacher to student communication website and I saw a certain grade, while the professor is absolutley sure he entered the correct grade and has proof of it. I know at the time I checked the grade, I had viruses and a lot of them on my computer. Does anyone have any knowledge regarding what kind of virus could possibly target a single character on a page and change only that? I have been trying to do research on this but have gotten nowhere. I saw 82.5 when the correct number I should have seen was a 72.5! Can a virus do that? Change a 7 to an 8 on a page? Imagine that the only possible source of error is on my computer, are there viruses out there to your knowledge that would target only one number in the entire page and change it? Thank you for everyone's help in advance!

It sounds more like a hack than a virus.
Is this a public school? Schools don't have much security when it comes to logging in.

I would try using another computer, perhaps one at the school and see what the site says.

Perhaps someone knows of a virus, I am afraid I don't.