About 2 weeks ago I had a problem with my computer crashing because of over heating, but before I realized that was the problem I tried to boot in safe mode and run repairs and such. Once I opened the computer and fixed the fan I was able to boot normally, but I couldn't connect to the internet. I then did a system restore and was able to connect to the internet, but it has been extremely slow. I've had speed tests over 100 mb/s for download and over the last 2 weeks I've had under 1 mb/s. Its not a modem/router problem as both work fine on other machines. Any ideas on what I could have done wrong?