Stupid errors!

This has been happening for quite some time now. Does anyone know how to fix it? The problem is, that when Im working on an image, the cursers sometimes dont work at all or dont show up, and i cant use the tools And i have to save my work and restart for it to work again. Does anyone know what’s causing this? I only bought cs about a month ago, this is pissing me off now. It occurs like every five minutes now! :angry: