The Session Manager Initialization system process terminated unexpectedly..Windows XP

HI My computer today gave following error

Code:

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The Session Manager Initialization system process terminated unexpectedly with a status of 0x000003a
(0x00000000 0x00000000)

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It failed to start and now I am using laptop. I am running windows xp and I can't get my computer back running. Please help me to solve this problem. Google searching was of no help bcz i was unable to understand wht process they specify to solve ths problem.

I don't want to loose my data please help.

HI I think you need to resintall windows becasue your files are corrupted.