You need more RAM.
Okay, so, it has 768MB RAM, and an Intel(R) Pentium(R) 4 CPU 3.00GHz Proccesor, can that run L4D?
the forget.How do you get the same amount of RAM as my 2003 Compaq Presario but almost more processing muscle than I have now?
A better processor wouldn't hurt. I have that same thing, and now i'm upgrading to a Core 2 Quad 2.33 ghz. :D
What do proccesors do for gaming? Or in all for a PC. I need to learn badly.
How do you get more RAM?