Hey there. I would like to know which software/s are necessary and suitable for my OLD pc.

Specifications:

Intel Pentium 4 2.00ghz
ASROCK mobo
64mb + 128mb ram
20 gb HDD + 40gb HDD
Windows XP Professional SP2

I'm not really sure about the essential softwares needed but currently im using these softwares:

Mozilla Firefox 3
IE 6
Avira AntiVir Personal- Free Antivirus
BlazeDVD 5.0 Professional
Ares
Ashampoo Photo Commander
RealPlayer
QuickTime Player
WMP 8
Media Player Classic
Vimicro USB PC Camera
Nero Burning Software
Ccleaner
a-squared Free
WLM 9

Please tell me which software I should uninstall in order to optimize the performance of my OLD pc. Thanks in advance