Hello.
I'm having problems with Win XP recently. The applications I've been using, which were always running ok, now crash without any reason.
I'll take few examples.
Firefox - crashes with the error message, sometimes when I run a java application it crashes even without it
Freespace 2,Diablo 2, both old pc games, they crash with an error message, be it unhandled exception c0000003 in D2 or a simple win error message in FS2.

I don't know what could be wrong.
The recent changes in the pc was inserting a new ram ( 512 ), when I had a 256 one.

Any ideas, anyone?

Thanks in advance,
-K