I'm running Windows 2000 Service Pack 4.

I'm trying to free up space on my computer, but EVERY time I go to Add/REMOVE Programs to delete things, I get two errors. The first one says:
"An unexpected error occured.
 
Class not registered

 res://appwiz.cpl/listbox.htc
 Line:225"

After clicking OK the program list loads, but when I click a program I get this error
"mshta.exe has generated errors and will be closed by Windows. You will need to restart the program.

An error log has been created."

Yeah I have restarted the program several times, as well as my computer. I use avast! antivirus software and I have done extensive scans. It removes one or two things but none seem to help. Any idea of what this errors mean and what I can do to stop them? Any help would be much appreciated.Gee you had me stumped so I researched and got this....File mshta.exe is a COMPONENT of the Windows operating system, It is used for interpreting scripts written in Microsoft Scripting lagnuages. DELETING this file may cause system error. It mentioned this program and how it can help with MSHTA.exe

WinTasks 5 Pro is the ultimate power utility software that arms you with complete information and an arsenal of heavy duty tools putting you in full control of your computer. These are just a few of them:
WinTasks 5 Pro will help you remove all unnecessary start-up applications and boost the boot-up time dramatically.
The only thing is I dont know if you have to buy this software or not...I hope someone else can help you.....thanks, I looked up the program and I'll look into getting it if nothing else works.Like I said, hang in there and someone soon will be around to help you out!Go to Start / Run and type in sfc /scannow and hit Enter...have your Win2K CD handy as it will ask for it.