Are you referring to the shortcut for *Internet* Explorer or (Windows)
Explorer?
Is the shortcut to *Internet* Explorer missing from your Start menu?
Is *Internet* Explorer listed or available in Start | Default Programs?
Have you installed another browser (e.g., Firefox or <god forbid> Safari)?
Are you running Vista SP1? <=ONLY a question!
What changes may you have made to the machine before you restarted it?
What anti-virus application or security suite is installed? What
anti-spyware applications (other than Defender)? What third-party firewall
(if any)?

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~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Desktop Experience - since 2002
AumHa VSOP & Admin http://aumha.net
DTS-L http://dts-l.net/
> suddenly after restarting my computer the shortcut explorer disappeared
> and
> can only start explorer by starting window update and change then to my
> home
> page