There could be a few reasons why this would be happening, An infection can cause your system not to shut down or restart on command. I recommend letting a professional take a look at it for you.
I know of a good tech who offers free advice and remote diagnostics that should get to the bottom of your computer problrems. You can learn more about infections and security here: http://www.pcheleprdesk.com
This is the problem with the extra prefetch parameters because of excessive and unwanted program installed .
For this foe window xp just type in Run 'regedit ' Window registry will open Then Click on Hack_local_machine then in system->CurrentControlSet->Session Manager->Memory Management-> PrefetchParameters After clicking PrefetchParameters on right had site yor are getting the key called EnablePrefetchar You just modify that value data to Zero .and save it.
This for works for windows only and having 512 MB ram.
i presume u have installed xp and vista on one machine: they are using similiar routines, you may have to reinstall both of them!
if u do have setup-cds for both os, all software installed on extra cds and the drivers for your laptop, then back-up personal data, run a virusscan using avast! antivir -if nothing found: good!
then blank out your system( erase both operation systems,) until you have an almost empty harddisk, then format it and start installing the older os: (win-xp) first, set up a functioning win-xp system with all the drivers, then install vista same attention: all service programs must be installed in xp and vista! then try rebooting.
after hardware-check/ boot procedure you will be able to choose either xp or vista - and things should be normal now !
hi your computer is in virus by clearing the virus you can get faster to work in your computer , in shop there are more anti-virus software are available you can buy a better anti virus and remove the virus and run the computer. bye.
you might have install excessive programs or software..........don't worry, it is normal. or else use any system utility software to speed up your system.
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