Having touble with some of my tools in photoworkshop (CS4)
What product is "photoworks" or "photoworkshop"?
You really need to take the time and make the effort to be accurate. "Close enough" doesn't have meaning; things need to be exact. Yes, I know you're talking to people here, and we can all figure out that you mean Photoshop, but if you apply the same looseness to your computer work you will mess things up more than make them work.
What do you mean by "the blur tool doesn't respond"? We are not mind readers.
Did you mean, "I select the Blur Tool from the tools panel, then stroke it on my document, but it doesn't seem to blur anything"?
Curt's suggestion would fix it, but the reason you've gotten into the condition you have is probably because you have not got the Strength or Mode set properly in the Options bar: