I have two years hands on experience with pc's and win-95. I am used to my employers computer tech entering and saying something like '16 mb of ram is more than enough for this office and adding more would not speed up things or prevent the need to reboot every 3 hours' Then I ask "well why does the same computer you have with 128 mb run faster"? 'well thats just luck'. So I decided to buy a book to explain. I think Peter Norton is the PC tech I have been talking to. The book gives a BASIC DESCRIPTION of the guts of the PC but does not explain in detail the reason you want one upgrade over another and it certainly does not tell you how to do something in enough detail to make it a smooth install. For example what if you change EDO chips and get an error? Just the possibility of that occuring should stop some novices from screwing up there system and finding a tech to perform the install for them. No, this book is not a guide. It provides just enough info for the novice user to screw up his/her computer. BEWARE!!!!! By the way when the tech left the co. and we installed 64 mb of ram the computers ability to receive info from the server doubled and the units quit crashing every 4 hours with lack of resources warnings.