N200 shuts down during boot

Dear Lenovo,
I have a problem with my N200 laptop. Notebook shuts down during boot. Sometimes it is immediately after "Lenovo screen", sometimes it is when Vista logo appears. I found out that this is always when notebook is "cold". It does't matter if I want to switch on my notebook or if I want to restore it from hibernation or sleep mode. Next thing is that it always crashes when fan starts work at full tilt (I checked the fan but it is clear). When notebook starts correctly then it works without problems. Usually I have to switch it on about three times then it is OK. This problem takes about 2 weeks. I have my laptop about 7 month. Do you have any ideas how to solve this problem?
And another thing - I forget to send registration card to Lenovo and now I am afraid that I will be without warranty. Can I send it still now?
Thank you for answer and sorry for my English.
Gabi

Yes, problem with the video card sounds plausible! Any not so successful updates recently? It is sometimes to make a good uninstall, which is required to make a good install.
4in1 drivers should - esp. with W98 and ME - be installed while in SafeMode and with all autostarting programs disabled, for example Antivirus and utilities.
Else, since you have a damaged regedit, I would reinstall Windows. You might have done something for example an upgrade or new install the registry, not healthy, has made a note of. Some utilities also overwrite and change system files without good results.

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