Dam PC... Any support tips???

My PC is a lil old, but I guess still functional...
AMD ATHLON XP 1.8, 256RAM, 20GB, GForce 440 MX, Windows XP...

Recently this shit PC, starting to freeze, when I ask for him do some easy things, he need a lot of time to execute...
For example when I try search an image on PC to put in 4Chan board...

Others things I can do quickly, like, open browser, open iTunes, etc...

I have 6GB Free in HD...

I just use PC for work (Word basically), some Photoshop things, play some games like RO and AOE 3...

I'm thinking about, buy more 512RAM and 80GB hard disk... You guys think it can resolve my problems???

Any sugestion please?
Thank you very much...
See ya...

Lol...
Thank you... But, I'm not too rich. XD

Any other sugestion? No Linux also, please. XD
I still want use my PC and the microsoft thing. lmao.