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Video quality in full screen mode (any player) looks blocky/pixelated. Why?

Hello all. I am new to the forum and apologize for any replication in my quest for knowledge.

The System:

Dell Inspiron 531S (Stock Board)
Genuine Windows 7 Professional (MSDN)
AMD Athlon X2 64 6000+ 3.0GHz (Windsor Edition)
WD Caviar 160GB SATA 7200RPM HDD x 2 (No Raid/1 OS)
8GB (2GB x 4) Corsair XMS2 DDR2 800MHz CL5
XFX Radeon HD 6670 SFF 2GB GDDR3 PCIe x16 2.0
400 Watt TFX PSU
Vizio E260MV 26" 1080p LED LCD TV (set at 1080p 60Hz)
Logitech Wireless Trackball M570
Logitech Illuminated Keyboard Y-UY95

The Curiosity:

So I have this system and I have it connected to my TV via HDMI. For the longest time now I have been trying to figure out why when I download a video that is 1080p it doesn't look like 1080p in full screen viewing. I have noticed that with different file extensions the quality is different, and the initial "native" size of the player when you double click to open any given extension varies as well. The videos all look amazing when they are in the player's various small "native" sizes, but become blocky and/or pixelated when you set the player (any player) to full screen viewing. It seems as though the videos maybe optimized for mobile devices or something with a much, much smaller screen than my 26" Vizio. I have done some reading around to try and find out why and I refuse to believe it's because my screen is "so big", ppi is ppi is ppi. An inch is an inch is an inch. So why doesn't the "1080p" video look good at full screen? I am wondering if it doesn't have more to do with how the video was coded or encoded or whatever has been done to it. If I hook a BD player up to my TV the picture is amazingly clear and beautiful. A PC with a high-end video card should be able to acheive the same or very similar results, but that's not the case. I have tweaked, installed, re-installed, cleaned, scanned, removed, clean Windows install with full format, swapped cables, swapped ports (both HDMI and DVI), changed CCC settings, changed CCC versions, changed TV settings, everything is set to 1080p 60Hz, underscan, overscan, 4:4:4 RGB full, nothing changes the quality of these videos. Is it just the nature of the beast or is it something else? This TV has a VGA port so I have to believe that they intended it to be used as both a TV and a monitor. It can only be a few things and I really just wanted (hoping) to see if there were someone out there who could explain to me in a more than general way about how the ripping and coding of videos affect the rendering of those videos, such as in my case with the full screen issue, or to explain why my video card is a piece of crapolla and doesn't work well with my system or my TV or something other than my TV is too dang big for watching videos on my PC. I appreciate any enlightenment in the matter.

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