File for future reference:

* Step 1: Uninstall the Bioshock game/demo.

* Step 2: Remove the Securom registry entries.
The Securom registry entries are deliberately made non-removable by default. In order to remove them download the http://www.microsoft.com/technet/sys...egdelnull.mspx [...] RegDelNull registry editing utility from Microsoft and install it on your C partition.
Run the following two commands from a Windows command prompt: "C:\regdelnull HKEY_CURRENT_USER\Software\SecuROM -s" and "C:\regdelnull HKEY_USERS\<Computer specific key>\Software\SecuROM -s" where "<Computer specific key>" can be determined by searching the registry for the "Securom" directory key. This "<Computer specific key>" typically has a form like "S-1-5-21-2052111302-1757341266-724545543-500". Once these two RegDelNull commands have been successfully issued the registry should be checked to confirm that these two keys have been deleted. If they are still present they will now be removeable due to the action of the RegDelNull utility.

* Step 3: Removal of the Securom service and related utilities.
Open a Windows command prompt and change directory to "c:\windows\system32". Type "uaservice7 /remove". This will stop the Securom user access service, and clean up its relevant registry entries. On the Windows command prompt type "regsvr32 /u cmdlineext.dll". Reboot and then manually delete the files "uaservice7.exe" and "cmdlineext.dll" from "c:\windows\system32". Note: Both of these files are Securom installed files which can be verified by checking their file properties (Right click - Properties).

* Step 4: Removal of Securom files under "C:\Documents and Settings".
Securom installs a hidden directory with 6 files under "C:\Documents and Settings\<Your Administrator name>\Application Data\Securom". The first 4 ordinary text files can simply be manually deleted once Windows explorer has been configured to show hidden files and folders. The two remaining malformed nominally unremoveable files require a special method to delete: Invoke a Windows command prompt with full Administrator privileges by typing the following into a Windows command prompt: "at <your current time + 1 minute> /interactive %systemroot%\system32\cmd.exe" e.g. "at 9:02pm /interactive %systemroot%\system32\cmd.exe". This will open a new Administrator command line when the time set has been attained. In this new command prompt change directory into the Securom folder e.g. "cd C:\Documents and Settings\<Your Administrator name>\Application Data\Securom". Issue the following command to show the two remaining hidden malformed files: "dir /A". To delete the two remaining hidden malformed files issue the following command: "del /F /AH *". Confirm "yes" for each of the two file deletions of the malformed files. Finally, the directory "C:\Documents and Settings\<Your Administrator name>\Application Data\Securom" can be deleted as per normal practice from within Windows explorer. "

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So easy a caveman can do it.