Clean Up Computer

Ok, I have some troubles with my computer which is Xp Professional. There are several errors that my registry cleaner had detected so far, but since its a trial version it cannot fix those issues. There are still more than 200 registry errors, many of them are these temporary file shortcuts. Is there a way to get rid of them manually without using a registry cleaner? Its hard to find them on the registry editor.
I have been using CCleaner for some time now. But it cannot detect much of the errors.