Can my computer run halflife 2 -also sound problem Please Help!

I have a:

1.3 ghz intel celeron proccesor

NVIDIA GeForce4 Ti 4400

380 mb ram

Can my computer run halflife without those really long load times.

Also ive had no sound for quite some time, my computer has an integrated sound card so if i bought a new sound card do you think this would solve the problem?

But how will the load times be and will it lag much?microblasta