Popup windows in internet explorer 8 hang and never finish downloading

"I called Microsoft about this problem and after about 2 hours on the phone I came up empty handed. They were unable to determine the cause of the problem and they suggested I rebuild the computer.

I did this and confirmed that the Outlook Web Access site worked as I installed applications to get my computer back to it's original state.

I eventually tracked the problem down to the source control program Vault (http://www.sourcegear.com/).

When I installed the client version 4.0.4 the problem occurred. If I uninstalled and rebooted the computer the problem would go away. Unable to believe it the first time I tried it again. There is no mistaking that this is the problem...

I am speachless...

Update 12/1/2009:
I contacted SourceGear technical support and they researched the problem and suggested I run the following commands to re-register some DLLs.

regsvr32 ""C:\Program Files (x86)\Internet Explorer\ieproxy.dll""
regsvr32 ""C:\Program Files (x86)\Internet Explorer\actxprxy.dll""

The second command failed for me as the DLL is not on my system but the problem appears to be resolved."

"Thanks i was having this problem on win7 32bit and running
regsvr32 ""C:\Program Files\Internet Explorer\ieproxy.dll""
and
regsvr32 ""C:\Program Files\Internet Explorer\actxprxy.dll""

work for me"