lights.exe

lights.exe is a Microsoft tool which places a modem status icon on your tray bar. This is a non-essential process. Disabling or enabling this is down to user preference.
And there also is a Spyware program with the same name Re:http://www.2-spyware.com/file-lights-exe.html

Can't Install Service Pack-Copy of WinXP is illegal

The case History:-
A user upgraded his operating system from Windows 98 over a year ago. He activated the installation and has been running ever since without any problem. The otherday when he tried to install SP1 he got a message that his copy of WinXP is illegal. His question -how can it be illegal as he has already activated it and it has been runing for over a year?

Solution:-
Error Message: The Product Key Used to Install Windows Is Invalid http://support.microsoft.com/?kbid=326904
If it does, it means he was sold an illegal copy of the commonly distributed volume license version. He will need to purchase a legal copy before he does anything.

Activation Problem

During solving various problems in Microsoft newsgroups I have come accross to this problem many times.It asks the user repeatedly to activate his/her Windows XP though it has already been activated.

How To Solve:-

First Method:-

Start>Run>type in:"regsvr32 regwizc.dll" (without the quotes) >ok.
Start>Run>type in:"regsvr32 licdll.dll"(without the quotes) >ok. You should get a successful message for both and it should resolve the error message.

Second Method:-

If the first method fails then:-
Start the computer in Safe mode by hitting F8 at startup.
Start>Run>type regedit>ok.
Now navigate to the following key:-HKEY_USERS\.DEFAULT\Software\Microsoft\Cryptography\ProvidersHKEY_USERS\S-1-5-20\Software\Microsoft\Cryptography\Providers
Click on the folder representing each key and delete them. Now close the registry editor and restart the machine.