Hiya. thanks for reply's guys.
THambrecht , i think i owe you a beer or 2 - weird thing is i moved contents to a new main folder with same name and was still getting error , even renamed it to test ,, However a full copy and paste as you suggested to the new folder has solved the problem :) , my old projects all loading correct and playing as they should (not tested all but looks promising right now)
Bob , all the sounds are loopmaster packs i purchased all files have generic names and worked fine couple weeks ago weird thing when i browsed my sample lib everything was there intact and sounds all playable on media player, so still no idea to actual cause, maybe put it down to windows being silly , and definitely time to do a fresh copy of all my projects and sounds to a external for safe keeping..
thanks again , just happy all them countless hours are not wasted :)