Windows won't start

[Guest]

After installing Panda Antivirus Titanium Trial Version, I was asked to
reboot the computer, the computer won't load anything but the
background....as if the startup program explorer.exe can't run, I need your
help, thank you.

 

[Guest]

You may want to try to repair your OS since it corrupted explorer.exe (one
that loads your desktop). Run the repair program in your XP cd install.

GLuck!

 

[beb]

Start in safe mode and choose last known good configuration.
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/boot_failsafe.mspx

It that doesn't work try safe mode and system restore. Restore to a date
before you installed panda.
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/systemrestore.mspx