Scenario When attempting to install the e-Gap 3.6 version software, you might receive an insufficient disk space error even though there is plenty of hard drive space:
"There is not enough space on drive C:\ to extract this package. Please free up x MB and click Retry"
This situation is also applicable to other products. Information and a description of the cause can be viewed here: http://support.microsoft.com/kb/q189787/
When I encountered this error, I reduced the amount of free space on the hard disk to be slightly below a multiple of 4 GB. Also, you could increase the amount of free space on your hard disk to be at least 100 MB above a multiple of 4 GB. It is a good idea to start by clearing the %temp% directory.
Once this was done, I was able to run the e-Gap setup again with no issues.
Renato Menezes Security Support Engineer – IAG Team Microsoft – North Carolina