Did you make all updates for XP?
If not, here the link:
http://www.update.microsoft.com/windowsupdate/v6/thanks.aspx?ln=en&&thankspage=5
Did you clean your registry?
If not, here a link you may want to use:
http://www.majorgeeks.com/files/details/7smoker_pro.html
Did you make a deep scan of your system to be sure that it is not in any way infected?
If not, use the following link for Windows:
http://www.microsoft.com/security/scanner/en-us/default.aspx The scan can take hours. So you may do it over night.
Did you try any tune up software like TuneUp 2013?
If not, here the link:
http://www.tune-up.com/ Just use the test program.
Did you use the troubleshooter in Windows to test LG?
Has your XP system all what you need to run the LG system?