I have noticed my system's performance has decreased a bit. This hasn't changed after formatting the hard disk. The symptoms are: Little noises when listening an audio CD (whether it is new or a copy), jerky motion in games and DVD movies. Perhaps my 128 Mb of RAM are not excessive, but this didn't happen before.
Can somebody give me some advice? Thanks.

Dell Dimension 8100
Pentium 4, 1,5 Ghz
128 Mb RAM
60 Gb Hard disk
Nvidia GeForce 2 GTS DDR 32 Mb
SoundBlaster Live 1028