I normally have a very fast connection that has about a 1.5-2Mbps DL limit and a 2Mbps UL limit. I have forwarded my ports to previously great success. Recently my DL speeds on Utorrent have dropped from a usual 1Mb to about 100-116kB max. Nothing has changed in my set-up. Just the speed.
I ran my ISPs speed checker and my speed is now around 50-60Mbps. My ISP says I have a 100Mb but that really the best expected speeds are 80Mb. They say my connection speed is quite good. I'm not sure if my actual connection has become slower, but I know that my downloads and uploads on Utorrent are much slower. Sometimes my PC would slow down and occasionally crash because the files were downloading or uploading so fast. Are there any common viruses that interrupt internet download speeds?
I ask because the last time I switched to this optic fiber service I couldn't get full speeds because my PC had some sort of virus that was interrupting the signal. The connection into my place was fine, but my PC wouldn't accept the bandwidth. I had to have my PC reformatted and everything. I'm wondering if that's what happened now...
I use NOD32 2.7 that updates several times a day regularly, and just did an indepth scan, but found nothing. I also just recently used an updated Spybot S&D to clean out a lot of spyware, but my connection has not really improved.