A day (bad day) you decided to re-install your version of FTK3.X
“What you need to do for survive?”
For FTK3 there isn’t any problem… for Oracle can be a hell.
First of all: by add/remove Wizard remove FTK3/Local Engine and Oracle.
Second step for prevent error 27557:
->Delete this key of registry: HKEY_LOCAL_MACHINE\Software\ORACLE\
->Delete this Directory: C:\Program Files\Oracle\
->Delete this Directory: C:\Oracle (Default Installation)
->Under this key:
Delete all keys that start with: Oracle….
-> If you are using an’ISO image mounted with “Daemon Tools” disable the physical CD/DVD ROM:
->If you got again the Error 27557 then check the logs<-