Deleting the folder shouldn't make any difference. If that does seem to help it's probably just a coincidence.

Can you give me a few more details like what version of RealTemp, where do you have it installed, what CPU and speed and what sort of hard drive are you using and how full is it. Usually if the driver doesn't get loaded it is because the computer is bogged down doing something else. If you have a virus scan or similar going on in the background, maybe that is causing the problem. Have you been using different versions of RealTemp for a while and has this problem been around for a while or is it a recent problem or not sure?

The WinRing0 driver RealTemp uses is open source and I didn't write it so I'm not sure if there's anything I'm going to be able to do to help this. Give me a few more details and I'll see if there's anything I can do to help you out. I might be able to add more delay time to RealTemp when it first starts up so it has more time and a better chance to load up the driver.

Are you in an account with Admin privileges?