not enough disk space

The error that you are getting is not referring to resources available, it is referring to hard drive space available. You did not list the size of your hdd, nor the space available - chk these things first. You may have temp files, chk files or other programs that you can remove to free up space, otherwise you need to upgrade your hdd to a larger model.

Vickie

You didn't state which program you were trying to install. Believe it or not, this can be an issue. For instance, MGI has a fix posted on their site for the same problem you are describing - (the error message comes up during the direct x install portion of MGI Photosuite). First I would suggest you check with your product vendor to see if they have any known issues that you describe. If not, then on to the next...

I hope I'm correct in assuming that when you get the message, it's also offering to run the disk cleanup tool? If so, you can disable this sometimes annoying reminder. Here is a link to Microsoft's site that tells you how to disable that feature:
http://support.microsoft.com/support/kb/articles/Q193/6/83.ASP?LN=EN-US&SD=gn&FR=0&qry=disk%20space&rnk=26&src=DHCS_MSPSS_gn_SRCH&SPR=W98SE

Have you run scandisk and defrag lately? A clean drive is a happy drive! ;-)

Hope this stuff helps!

Tina, A+