Solved: Digital display problems

I have a Dell Inspiron desktop and a Samsung digital monitor. I had been using it in analog mode because I didn't know enough to realize I needed a different cable. The situation came to light when a friend sent a link to a "gigapixel" shot of a crowd and it should be possible to enlarge an individual face to see the person quite clearly. Here:
http://www.gigapixel.com/image/gigapan-canucks-g7.html
I could get down to see a bunch of people well, but adjacent photos would be blurry. My friend said that there were no blurry faces when he enlarged a section. I'm attaching a screenshot.
The Dell only has an HDMI socket and regular analog socket. I got an HDMI-Digital cable but it hasn't improved things. I need some advice and direction. Thanks

SysInfo
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Professional, Service Pack 1, 64 bit
Processor: AMD Athlon(tm) Processor 2650e, AMD64 Family 15 Model 127 Stepping 2
Processor Count: 1
RAM: 3838 Mb
Graphics Card: ATI Radeon HD 3200 Graphics, 256 Mb
Hard Drives: C: Total - 694104 MB, Free - 554315 MB;
Motherboard: Dell Inc., 03D1TV
Antivirus: AVG Internet Security 2013, Updated and Enabled

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Attached Files

DDS.txt (21.6 KB)