Did I make some thing wrong? Is my computer broken?

 J_1     =       NEGATIVE PRESSURE AT POINT         1232
 *********************************************************************************
 Model aborted with error code -    1 Routine and message:-
                                     P_TH_ADJ : NEGATIVE PRESSURE VALUE CREATED.
 *********************************************************************************
L    =          71 
 JMTP1_GLOBAL    =          74 
 J_OFFSET        =           0 
 O_MYPE  =           0 
 O_EW_HALO       =           0 
 O_NS_HALO       =           0 
 J_PE_JSTM1      =          -1 
 J_PE_JSTM2      =          -1 
 J_PE_JFINP1     =          -1 
 J_PE_JFINP2     =          -1 
 O_NPROC =           1 
 IMOUT   = 4*0 
 JMOUT   = 4*0 
 J_PE_IND_MED    = 4*0 
 NMEDLEV =           0
 $END
 SLAB TIMESTEP         3721
 im,sm,ngroup,new_im,new_sm           1           1          48 T F

My Computer:
- Pentium 4 without HT
- 1 GB DDR-RAM
- Windows XP SP2

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The NEGATIVE PRESSURE problem is caused by an error in the calculations.
It may be that your computer is not 100% stable.

A few possibilities:
Don\'t overclock
Make sure that there is good air flow through the computer (not being blocked by ribbon cables, etc)
Clean all dust from the box, ESPECIALLY from the cpu heatsink
The power supply may be bare minimum, and not able to keep the voltages stable on a sustained basis
The room temperature may be high, and not allowing the computer to stay cool enough for continuous, intense operation.