I am having problem installing the .Net Framework SDK.

I have an old Pentium 3 set up as an NT server and wanted to try the new
framework out. It has a partioned hard drive with NT on C: and programs on
D:. I had to upgrade nt to service patch 6a and upgraded my Sql to sql 2000.
I then got a warning from the SDK to free up some space on my c: drive.
However, once I freed up the space, .NET doesn't recognize the additional
space. It insists I have less than 80 megs free depsite NT Explorer saying
I have 190 megs free. Does anyone have any suggestions on getting the .net
framework to recognize the space???