Help Me Please

hi guys...i got a problem with mi NIS 2005......my subscription expired and i wanted to uninstall and reinstall to get more days.....i did it and it got a problem....it didnt want to let me do that....so i tried to uninstall it manually......i erased the main folder in program files and used a registry cleaner to quit it from the uninstall list....but it didnt work and now when i execute an office aplication or something that is linked to the NIS appears a window of windows installer....after that appears a message from the NIS that says "Norton AntiVirus 2005 doesnt support the Repair feature, please uninstall and reinstall"....but the thins is that i cannot do that.....so please help me...i dont wanna have to format my laptop...tell me any procedure that u know with the one u could help me without erasing all my data.....i thank u guys a lot..thanks.....i hope u can help me