I think the mentioning of the school is the key. Port 80 is particularly important to all internet activity. I'm guessing that without protection she picked malware of some type. Run the tests on her computer, then copy them to yours and post as follows.
I recommend that you read this article…
follow the instructions very carefully; then, post all the requested logs and information; as instructed, in the Virus/Trojan/Spyware Help - Tech Support Forum
section of the forum.
(Simply, click on the colored links to be re-directed.)
Please ensure that you create a new thread in the Virus/Trojan/Spyware Help - Tech Support Forum
Forum; not back here in this one.
When carrying out The Malware Removal Steps, if you cannot complete any of them for whatever reason, just continue on with the next one until they are all completed.
However,it is extremely important to make mention of the fact that you could not complete any of the steps in your post to the Virus/Trojan/Spyware Help - Tech Support Forum
Forum; where an Analyst will assist you with other workarounds.
Once done, please be patient, as the Security Team Analysts are usually very busy; one of them will answer your request as soon as they can.
One final thought. Reset her Internet Explorer settings Advanced>Restore Defaults. There's a chance someone "messed" with her computer.