Sisters HP is taking over! (Win98)

What do I do about a fatal error…’Explorer has caused an invalid rage fault in kernel32.dll@ 015f:bff7b9e7′. Has shut down once and re-booted once ‘on its own’! Have to restart some programs sometimes, like JUNO, to get connected, or to keep surfing when ‘can’t find/connect…pages’. I suspect the freezing and ‘multiple layers of the same page'(even when closing and going to another) are related to mem, to much opened at once(64mb ram). Some of this started after installing Uninstaller a while back, but she kept going. Started getting worse in last few weeks. Updated DAT files recently and found a trojan but I don’t think it was opened. Other stuff too. Help please. TIA!