Shutdown problem and unable to delete certain programs.

[Cider]

Hey guys

I found something in my accounts. Right click [My Computer] ; manage ; and you go into the different types of users. Power users , administrators etc are listed. On dbl clicking on Administrator. The following was listed.

Administrator
Cider - which is myself whom

Now there was a third one listed.

Sis [ or something similar ] with digits listed with it. I should of taken a screenshot however I got so paranoid I just hit delete and rebooted. This all happened so fast so it might not have been Sis or whatever.

Can anyone comment on this?

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Ok on the original issue. Where can I reinstall/uninstall the "Windows Installers".

Thanks.

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One more thing. I was connected to a domain when I installed certain programs, cant remember.

Now I am not, my machine is at home now not at work.

Could this also be a problem?