Recently I decided to try out Windows live mail. However there were aspects of it that I didnt like. This included that the fact that when I tried to open eml files in OE they failed to open.

I decided to uninstall Windows Live Mail.

However, when I reopened OE and tried to open an eml file, the system couldnt identify what file type it was and wouldnt open it. 

In the end I had to do a system restore to the point at which WLM was installed.

Is this normal?  And if installing/uninstalling WLM causes these issues, I have to wonder how someone with less PC knowledge than myself  would deal with this situation. 

If I install or uninstall a program, I dont expect it to interfere or disrupt the operation of another application.