Help, can't access or delete Itunes

I had a hard drive crash a few months ago and it assigned the new hard drive as drive F. After, putting in a DVD Burner, it then assigned the Hard drive as H and the DVD as F. When I attempt to use Itunes to clean up my library on my Ipod, it get an error. I randomly search my computer when I noticed that a lot of the Itunes software were assigned to F drive as a target Frogram files. Itunes.Itunesexe. I changed the directories be assigned H instead of F. I still cannot access Itunes and when I tried to do a uninstall I get, "Error 1324, The path program files contains invalid character. I tried to use the Itunes CD to over write , but with no sucsess. I will be backing up my system, but I don not want to back it up until this error gets resolved. Thanks for any help in advance.