Steam problem

[Sliver]

I've installed steam on a different hard drive than what I have Windows on. Almost every day, I have to uninstall/reinstall, because of this.

I've gotten this error about 7 times, each time rebooting, launching from a different place, to no avail, even after restarting. It is quite aggravating, and starting to tear at my sanity. I could really use some help.

The error is after right clicking on the launch icon, and going to friends.

Please, please help.