求救：我的MYSQL经常CPU100%！！！

WIN2003,CPU 3.0GX2 内存1.0GX2

MYSQL.INI内容：

[mysqld]
basedir=C:\mysql\
datadir=C:\mysql\data\
back_log=384
key_buffer_size = 384M
max_allowed_packet = 2M
thread_stack = 256K
table_cache = 512
sort_buffer_size = 2M
record_buffer=2M
read_buffer_size = 4M
join_buffer_size = 8M
myisam_sort_buffer_size = 64M
table_cache = 512
thread_cache_size = 8
query_cache_size = 64M
tmp_table_size = 256M
max_connections = 768
max_connect_errors = 10000000
wait_timeout=5
connect_timeout=5
thread_concurrency=8

各位专家看看参数哪里有问题？怎么修改？