im on my compter right now. the problem is occuring on my windows \nprofessional laptop.it all started when i downloaded a program that let a \nback door trojan horse into my laptop. after i downloaded windows defender \nand used it it said that 2 malicious programs were found and deleted. i also \nused my sbc yahoo anti-virus and anti-spyware program and they came up with \nno kind of infections. but i still had this little critical system error icon \nin my taskbar below and when i clicked on it, it would bring me to a site \nthat had some type of anti-virus program every time. i didnt i download any \nof the products cuz i already had an anti-virus program that was up to dat \nand running properly but i did download a spyware program called spyware \ndoctor. i got the official version and scanned for spyware. the results came \nback with 57 spyware infections, nothing like wat my yahoo anti-spyware said. \nso i used the advanced tools they had and deleted the infections and it asked \nme to reboot and so i did. and when the windows XP loading thing finished, it \ntook me to my profile log in thingy but instead of my log in box showing up, \na box that says "lsass.exe system error" along with "endpoint format \ninvalid" with and OK button. when i press it OK it restarts and starts the \nwhole process all over again. i tried every possible solution in the F8 \nbutton menu but nothing is working, it shows the same box over and over again.\n\nany one know how to get my lap top to function properly again?