I had Oracle 10g XE on my system on Win 7 OS. I was not able to access it as it was giving error, you do not have permissions to access.
I was able to access it before but after running a anti virus utility for tunning pc I lost it.
So I decided to install OracleXE 11 2 Win32, downloaded from OTN. Since I was not able to uninstall it I have removed it manually from drive,
and registry, but its still showing in Programs and feature and in Services which I am not able to delete even though I have Administrative rights.
Now when I am trying to Install OracleXE 11 2 Win32, its failing on "Checking for Oracle XE service instance" , please guide me what should I do now.
Thanks in Advance.
Try the manual deinstall steps in the 10g XE doc pages, "7.2 Manually Removing Oracle Database XE" at http://docs.oracle.com/cd/B25329_01/doc/install.102/b25143/toc.htm#CIHDDHJD
Specifically, the win installer cleanup step. Per the XE license you can't have more than one XE installation, if there are some pieces left over it can/will cause trouble with the installer.