all my programs will not open as they have an ink ext

Hello had a problem yesterday decided to put my solataire game on the D drive which I then could not open, I was asked what would i like to open with so clicked on the soltaire game since then all my desktop and start programs want to start with this program which cannot happen. i did it again chose adobe , which changed all the icons and shortcuts to adobe they all have ink files whatever that means I cannot even open my live mail as it come up with adobe everything on my pc I want to open comes up with adobe. help my Pc is useless for me to work with

Thank you I cannot do this as I do not know all the file ext for my programes

I have tried something like it it was still the same will try it again may be I did not do it correctly
thanks

I have tried the system restore it did not work it did not complete succesfully system restore failed to extract the file c/programe data\ trusteer an unspecified error accured during system restore 0x80070005
any other advice please

thank you I have norton installed just done a scan nothing reported