Anything you uncheck can be re-enabled later if needed like video and sound softwares where a service being automatically loaded is necessary like the Catalyst control center for one example. For video the ATI or NV items point to the video card while CTHELPER points at part of the Creative software. Likewise avgas points at an AVG antivirus function.
Once you get familiar with the software seeing what is and what isn't essential becomes easy. In the services tab in addition to the startup group you have to use a degree of caution and check the "hide all Microsoft services" box before disabling anything in there. Without that checked off the essential background services needed to run Windows even the explorer.exe file can be disabled and Windows will stall.
If you do accidentally disable the wrong thing you simply go through the Windows F8 boot menu to boot up in safe mode in order to open the msconfig and re-enable the item you unchecked to restore normal functions. You'll see the annoying popup screen where you simply check the "don't display this screen again" option when first reaching the desktop after restarting the system.
P.S. If you list what is seen there I may be able to identify some of the items you may want to leave enabled by matching those to the programs/hardwares on your system.
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