LOTRO client crashes all the time :(

Normally, it would happen 5 or, say, 10 times a day - each play session, and naturally results in me being killed or missing out on something important.

I'm really pis*** off. I don't know why this is happening.

Worts part is, I can see no pattern to it.
It frequently occurs when fighting or even when I'm on horse travelling from town to town.

My setup is quite advanced: no problems with any other games at all.

Win XP 32 bit
1 x Enermax Infiniti Modular 650W PSU
1 x Asus P5K Deluxe Wi-Fi (Intel P35 - 1333 FSB Conroe/Penryn)
1 x Intel Core 2 Quad Q6600 Retail (4x2.40GHz 1066FSB 8Mb)
1 x Scythe Infinity Heatpipe Cooler (all CPUs)
2 x A-Data DDR2-1000 2x1024MB Extreme Edition Dual Channel Kit
1 x 150Gb Raptor 10000 16mb E-SATA
1 x 250Gb Samsung SSD drive SATA
1 x 500GB WD Caviar RE2 7200 16mb Cache SATA II NCQ
1 x BFG Nvidia 8800GTX OC 768Mb PCIe HDCP

I've optimised all my settings as recommended, with page file etc but I don't know what to say.

Is there anything else I can do?