Ok, so SP2 of XP is like really old! More than likely you don't have the RAM to run it! That simple! OLD hardware! That simple!
In Windows XP it's not possible to run Counter Strike. Try Windows 7 & Windows 10 and increase your RAM & hard disk size. Through this game will run easily.
Try to download ccleaner, that should clean excess trash from pc. Then try to delete some files by yourself as well, if the message pops up again, try to run the program as administrator. Hope it helps!