Not able to delete file

Depends on what the problem is... Are you getting an error message or just can't find the recycle bin?

Are you running RT or Professional?

you need to provide more information
screenshots, error messages, etc.

Within Recycle bin, I select files and then press Delete. But the files are not deleted as expected

Do you get a message?

Try "empty recycle bin" from the menu

Hi,
I only get this
https://dl.dropboxusercontent.com/u/40211031/tt347.png

Please try "Manage", "Empty Recycle Bin":

sometimes you have to refresh the folder to see the deletions.

Sorry, the option is disabled below
https://dl.dropboxusercontent.com/u/40211031/tt348.png

I did refresh it but it is the same

I use IOBit Uninstaller

IObit Uninstaller 5
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http://www.iobit.com/en/advanceduninstaller.php

Try to remember what did you do last time before recycle bin became corrupted.
Did you mark your fixed hard disk as a removable drive?
https://support.microsoft.com/en-us/kb/173416
Did you change the icon of the recycle bin?
http://www.bleepingcomputer.com/forums/t/488296/empty-the-recycle-bin/
Or just try to reset the folder allocated to recycle bin:
http://www.thewindowsclub.com/recycle-bin-is-corrupted-windows

Try rebooting, then r/click recycle bin and empty.
Safemode so your outside of windows.
Are these windows files? testdb.dat ? Database files?
idx?
The IDX file type is primarily associated with 'Index'. The IDX extension is used by a wide variety of programs to indicate an index. This is usually an index into a database file. An index is useful in helping speed data requests from database files.
Please explain?
Other applications associated with file type IDX:
http://filext.com/file-extension/IDX

If you have Malwarebytes installed, click on the "More Tools" tab.
You can then run a tool called "File Assassin" to delete locked files.