I has a Dell Deimension 4600 using windows XP.  Last night the spyware malicious program Total Security 2009 some how downloaded it self.  Now I can not access anything, no internet, so virus protection, no firewall, no programs or documents.  I have the Windows Defender on a CD but I can not get to safe mode to intall it.  Can anyone give me any suggestions on how to get this off my computer or how to get to safe mode to install the windows Defender to get this off my computer?