Asphyxagion

Ok...My problem is little bit different...I installed win xp with 6 setup disk...and later installed sp2...and thenn office 2003...everything was normal...after one of the automatic updates (that i dont know which one or it's code cos it's auto) update restarted my computer...but this time whole my user account passwords was invalid...i tried the passwords on normal openeing and safe mode admin password also...no hope...(I AM SURE THAT I REMEMBER CORRECTLY MY PASSWORDS)....cant enter safe mode...cant enter normal mode...i formatted the hd...and then applied same procedure...but same problem....what can i do? couldnt find a solution in microsoft knowledge base...or any other place...is there a solution? please...it's enought to format and want use some cool new ie properties like block pop-up s etc..... thanks