Webpages/images don't load properly and requires one or more refreshes until it works

I don't remember when it started happening and or if I did anything weird with my computer but now every day I have to deal with pages not loading at all or loading without any formatting/images not showing up. I always have to refresh at least once for the page to load properly. I always get the This webpage is not available on chrome and The connection was reset on firefox. Those are the only browsers I've used but I assume it will happen on others too. I've tried clearing cache/restarting modem/flush dns/virus scan and googling this problem almost every day and I can't find any kind of solution. It's super annoying trying to browse the internet when I constantly have to refresh. There's nothing wrong with my connection since the page will always load at a normal speed/I don't lag when playing online games. I'm using Windows 7 and my isp Comcast.

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz, Intel64 Family 6 Model 42 Stepping 7
Processor Count: 4
RAM: 8139 Mb
Graphics Card: Intel(R) HD Graphics 3000, -1988 Mb
Hard Drives: C: Total - 595450 MB, Free - 151164 MB; D: Total - 14724 MB, Free - 1621 MB;
Motherboard: Hewlett-Packard, 1658
Antivirus: Microsoft Security Essentials, Updated and Enabled