100% CPU Utilization when we run queries.

We have a postgresql 8.3.8 DB which consumes 100% of the CPU whenever we run
any query. We got vmstat output Machine details are below:

# /usr/bin/lscpu
Architecture: x86_64
CPU(s): 2
Thread(s) per core: 1
Core(s) per socket: 1
CPU socket(s): 2
NUM node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 26
Stepping: 4
CPU MHz: 2666.761
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 12288K

Memory: Total Used Free Shared Buffers
Cached
Mem: 3928240 3889552 38688 0 26992
2517012
Swap: 2097144 312208 1784936

# /bin/uname -a
Linux wdhsen01 2.6.32.12-0.7-default #1 SMP 2010-05-20 11:14:20 +0200 x86_64
x86_64 x86_64 GNU/Linux .
Postgresql Memory parameters:
shared_buffers = 1GB
work_mem = 128MB
maintenance_work_mem = 64MB

I have attached the o/p of vmstat command alsp. Can you please help us in
tuning any other parameters.
http://postgresql.1045698.n5.nabble.com/file/n4465765/untitled.bmp

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