After installing ie8 in your machine you cannot debug the applications using visual studion 2005. Here is the fix for this.
Here are the few steps to fix this issue.
2.In that HKEY_LOCAL_MACHINE -> SOFTWARE -> Microsoft -> Internet Explorer -> Main
3.Right click on Main-->New-->Dwordvalue-->Name it as TabProcGrowth with a value of 0.
another way to fix this issue is
1.Open regedit (on a 64-bit OS, open the 32-bit regedit)
2.Under “HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones”, create a new key called 1000 (if it isn't already there)
3. Under 1000, create a DWORD entry with:
• Name = 1207
• Type = REG_DWORD
• Data = 0x000000