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You can try system restore using the XP's recovery console.

I know this is an old post but if you are a user who is having the same problem you can try the following also.

Remove unwanted system restore points or change the amount of disc space used for...

If you still haven't seen this check this out you might be able to solve your problem using this blog

I think this link will help you in solving the problem - http://support.microsoft.com/kb/318728
try this and let me know

gd luck !
247techie

Have you tried enabling SSL ?

Can you please tell me the OS , if possible try to get a screen shot and check event viewer try to get the error details,

will be waiting for the reply :)