ok .. you downloaded these Titanium files ? that are 5 .iso files ...
first double-click on the first one ... now windows will mount this .iso file to a virtual cd-drive ... ( dont know exact how to explain this .. my english issnt best _
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this new cd-virtual drive will have a new char letter ... ( E: or D: ... ) look for it wich letter is new after double-clicking this first .iso file ---
if you found the new letter . go into the directory and there will be a file with the name "setup.exe"
this file you must start to begin the titanium installation .
ok ok ... now the more complicated part ... the installation-program will ask for the next virtual CD ... but you only have mounted the first .. so you have to mount the 2nd .iso file with a double click and then say the installer-program the new drive-letter of this new virutal cd ----
and then the installation-program will ask for the 3nd virtual cd ... so now you dismount the 2nd by right-clicking on the drive letter and choose "dismount" ... (i dont know the exact english name , here with german language it is "auswerfen")
do this with all 5 .iso files ... at the end you will need again the .iso file no.1 but it is still mounted if you do all this how i said.
hope this helps.