Il pc si riavvia o si blocca

[Lattimer]

Salve a tutti
ho un problema.Il mio pc si blocca o si riavvia improvvisamente.Ho provato a togliere la ram ma niente da fare.
A questo punto ho provato a testarlo con Hot CPU Tester Pro
Vi scrivo la diagnosi:

Hot CPU Tester Pro 4.2.2
Copyright © 1999-2003 7Byte Computers
Wednesday, April 05, 2006 - 16:06:32
Diagnostic Report
---------------------------------------------
Test Started at: 09:58:09
Test Duration: 06:00:00
Physical Processors Available: 1
Logical Processors Available: 1
Multi-Processors System(SMP): Not Available
Hyper-Threading Technology: Not Available
CPU Name String: AMD Athlon(tm) XP 2400+
Speed: 1999MHz
Logical Processors Tested: CPU 0
Average CPU(s) Performance: 100.0%

Modules Results:
Complex Matrix: Finished without error
Calculating Pi: Finished without error
Sorting Algorithms: Finished without error
Prime Test: Finished without error
Fast Fourier Transforms: Error FFT:CPU 0: Error FFT checksums do not match ChkSum1=5295.12,ChkSum2=5295.12
Chipset: Finished without error
L1 Cache: Finished without error
L2 Cache: Finished without error
Memory: Finished without error
HD: Finished without error
MMX: Finished without error
SSE: Finished without error
SSE2:
3DNow!: Finished without error

Cosa vuol dire quell'errore??
Grazie a tutti