[2005] Keep having to do an Install on same version?

I have a couple of VB.Net 2005 applications installed on Terminal Servers. The problem I am having is that everytime a user logs off of one of the TS's and then logs back in and goes to execute one of the apps...it always prompts them to install the program again. Why is that?

Thanks,

Are your terminal servers possibly running a RAM disk?

I"m not sure but I can find out. If they are, how can that cause the problem?

on a ram disk all writes to the hard drive go to ram instead, so any installations would be installed in ram, not to the hard drive. Typically the ram disk would persist through multiple user log ins though and only get cleared on a shut down.
kevin

I'm almost postive we're not using a RAM drive put I will ask out Network Admin when he gets in. If we're not using a RAM drive...got any other suggestions?