Hi, most likely caused by a failed install (not the wizard) you need to do a bit of detective work, lets try the easy fix first:-
1. Go to start, run and type regedit.
2. Navigate in the registry editor to
HKLM\software\microsoft\windows\current version\installer\inprogress.
3. Click on the inprogress key and note the name of the file listed on the
right side for databasepath (should be have a .msi extension).
4. Rename inprogress to oldinprogress.
5. Close the registry editor.
6. Open My Computer.
7. Navigate to C:\Windows\Installer (Installer folder is hidden by
default, folder Views check "show hidden files and folders" also uncheck "hide protected system files", don't forget to undo this when finished)) and rename the file noted in step 3.
8. Reboot the computer and try the install again.