Downloaded AmigaSys 4 AGA

I see... you are doing something wrong for sure... double check everything, I'm sure you missed a little pass (you forgot to save the actual modified config on the Emulator side or in the Amiga side ... or something like that).
Better restart from scratch, uninstall WinUAE and then reinstall it (
http://www.winuae.net/files/InstallWinUAE2100.exe)... set the correct paths to your Kickstart dump/s and Workbench ADF images and then:
1 - download an already UAE/GfxCard enabled system like
http://amigasys.condor.serverpro3.com/download/AmigaSYS4.exe and BEFORE starting the exe be sure to read the offline manual
http://amigasys.condor.serverpro3.com/download/AmigaSYSHelpWinUAE.zip available in multiple languages...
2 - follow the online english instructions carefully
3 - once you're done and your system (hopefully) is up and running upgrade to the latest 1.3 version to date by using this
http://amigasys.condor.serverpro3.com/download/AmigaSYS4-UAE-R1.3.zipAmigaSYS update:
3-1, Unpack Update file.
3-2, Start WinUAE.exe, Load AmigaSYS 4 config file
3-3, Go Hard drives settings, Add update file Add Update (Add Hardfile...)
3-4, Press start button.
3-5, Wait, loading system... and double click AmigaSYS4 upgrade icon.
3-6, Start Installer and follow onscreen instructions.
3-7, Once the process is done reboot your emulated Amiga and, if you did everything the right way, it MUST work !!!
once you have a working system you can try to install other pre-build systems (since Amigasys hardfiles have the same name you need to pay attention not to mess with your working config, mind it!).
The screenshot you have taken isn't really self-explanatory (except from the fact that seems like you are running on the wrong Amiga screenmode from the "WinUAE Properties/Host/Display" then "Settings/Resolution"... are you sure you have "Hires (normal)" selected?)
I can't believe WinUAE is refusing to work on your computer, I'm running mine on an Acer Aspire 5710 with an Intel Gfx board (no fancy ATI or nVIDIA monsters) with WinXP-SP3 and the latest DirectX.