As noted in my profile running Windows 7 Professional and all was working well until a couple of days ago. I upgraded my internet service through Comcast to 30 Mbps download speed, and initially was not seeing that speed on my PC. I adjusted MTU on my router (Netgear WNDR3400 running DD-WRT) down from 1500 to 1450 and that seemed to allow the speed measured by Speedtest.com to go up to my anticipated 30Mbps. But almost immediately, I noticed while I could get email messages through my Comcast email account I could not get messages from my Charter mail account, and more worrisome is that I now have very limited ability to load websites...something seems to be re-directing the searches and the sites never load. Some load OK (like Bleeping Computer (luckily ), but while speedtest.com won't load, I can load the speedtest on the Comcast site.
I ran MalwareBytes and removed a few problems, and tried to install Avast Free (had been using AVG regularly), but Avast says "Unable to start scan: there are no more endpoints available from the endpoint mapper".
Please evaluate these symptoms and let me know a next step to take. Please also indicate if this should be posted and continued in another Forum...I wasn't sure where to begin so thought the Forum for my OS would be a logical starting point.
Thanks for any help and suggestions.