windows xp system restore

  JClthd 20:12 27 Feb 06

Can any1 PLEASE help tell me why occasionally it is impossible to go back to a previos date in Febuary using system restore. It just says 'your computercannot be restored to 10th Feb 2006. I have resrore dates there for 1,2,3,10,15,19,22,24and 27 and none are any use.
My computer is a relitivelty new one and is a Compaq Presario 061 - Processor AMD Athlon 64 processor 3200+ 1MMX - 1GB DDR-SDRAM.

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