If you haven't read this yet, read it! The definite article in the title may be misleading; of course Russell does not tackle ALL the problems of philosophy - indeed who is to say what they all are? The book is mostly confined to problems of epistemology - i.e., what we can know. Having said this, it provides an excellent introduction to philosophy generally. There is nothing quite like Russell's crystal-clear prose style, which immediately gives a sense of the best philosophical writing. No doubt reading this will give you the urge to explore more philosophy; it really deserves its reputation as the best introduction to the subject from an anglophone point of view. (For "continental" philosophy, try Sartre's "Existentialism and Humanism".)