Frozen out

[Edengland]

My E-machine repeatedly freezes, particularly when on the Internet.
It is running XP/SP3, 512 RAM, plenty of free diskspace.
I recently changed a CRT for an FTF, and freezes seem to be more frequent, but that may be just my preception.
Any ideas gratefully received.

[ACtheTROLL]

how old is the system
it might just be time to reload a clean install

[Edengland]

Hi ACT, the system is now six years old (how time flies). However, I have downloaded Firefix 3 and found it smoother and faster - so far, that is.
A supplementary: the machine came with XP preloaded. Without the necessary gubbins, how would it be possible to reload a clean instal?
Many thanks for your appreciated time.