Please DO NOT render irresponsible comments or suggestions. Everybody knows that this guy would DEFINITELY be in great trouble if he dares trying to sell photopaint.com to Corel.
Edit: this reply was written before safesys posts
It IS a TM violation. Unless you are as rich as Corel, you're gonna lose the court battle (if any at all) or simply bankrupt even before any hearing begins.
And when you search the USPTO database, please include all combos such as oneword, two words and hyphenated-words. Frankly, what makes you think that Corel has NOT registered this name? It is simply impossible!