In my opinion, they intended all along to mainline its utilities. There are now many fine utilities in Windows 98, and TweakUI duplicates some of these functions. For new users, better take a good look at all that is available to you throughout Windows 98 before thinking about downloading or buying utilities. I was told that my computer's lock up problems are caused by memory leaks. After the lockup, shutting down the computer for a while solves the problem temporarily.
Most modern computers have a substantial amount of memory.
This memory is needed to hold data and programs which are running at the time. Don't confuse that with hard disk storage, which of course is also memory. Programs tap into this memory batch as needed. All well-behaved software dumps that memory back to the pool when no longer needed. If for some reason, the software forgets to do that, it is called a memory leak.