i suggest virus cleaning and hijackthis
i dont know what else could cause ur task bar to flash colors... if its a windows problem u usually get a nice little error saying: u have an error, pls send bill gates $50 US dollars and he will tell u where to go to fix it. then when u get there it will tell u where to go to fix it again... and again and again...
anyhow... sounds like some one is hackin ur computer kus color disfiguration wouldn't add another taskbar
hit cntrl alt del and make sure nothing is running under processes taht u dont know about