I don't understand what you are saying or attempting to say...so pardon me if I ask questions that seem to already have been answered.
When you look in Device Manager...does it reflect a video card or chip? What is listed under Display Adapters? Is there any indication in Device Manager that this is not working properly?
Do you have problems changing your video resolution?
Is this onboard video?
What model Acer PC do you have?
What was the exact error message you received?
Did you uninstall this wwtelescope program...and see if the error message repeats?http://www.worldwidetelescope.org/Experien...t.aspx?exp=true
From what you've provided thus far...I suspect that your system does not meet the minimum requirements for installing/running this software properly.