Try disabling this BHO {BDF3E430-B101-42AD-A544-FADC6B084872. Don't delete it yet. This version of ToolbarCop has no Undo feature. [The Pro version creates registry backup automatically.]
Even better option: I would create a System Restore point and disable/delete one by one till the problem is solved. Now that you spot the plugin causing the problem. Rollback the system to the created restore point and delete the problem child alone.
Remember, the BHO and CLSID entries you've spotted are legit ones [not malware]. So, it's difficult to say which one is causing this problem. Some users say it's the norton BHO [above].
--
Ramesh - Microsoft MVP
www.mvps.org/sramesh2k
Free Online Virus Scanners and Security Tests:
http://www.mvps.org/sramesh2k/Scanners.htm
IE Toolbar Buttons
{08B0E5C0-4FCB-11CF-AAA5-00401C608501} IBM Java Console
{92780B25-18CC-41C8-B9BE-3C9C571A8263} Research
{FB5F1910-F110-11D2-BB9E-00C04F795683} Messanger
IE Toolbars
{01E04581-4EEE-11D0-BFE9-00AA005B4383} &Address
{0E5CBF21-D15F-11D0-8301-00AA005B4383} &Links
{2318C2B1-4965-11D4-9B18-009027A5CD4F} &Google
{8E718888-423F-11D2-876E-00A0C9082467} &Radio
{42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} Norton AntiVirus
{2318C2B1-4965-11d4-9B18-009027A5CD4F} &Google
IE Context Menu Extensions
&GOOGLE SEARCH
BACKWARD &LINKS
CAC&HED SNAPSHOT OF PAGE
E&PORT TO MICROSOFT EXCEL
SI&MILAR PAGES
TRANSLATE INTO ENGLISH
BHO
{06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} AcrolEhlprObj Class
{5CA3D70E-1895-11CF-8E15-001234567890} DriveLetter Access
{AA58ED58-01DD-4D91-8333-CF10577473F7} Google Toolbar
Helper
{BDF3E430-B101-42AD-A544-FADC6B084872} CNavExtBho Class
-----Original Message-----
Get ToolbarCop and see what browser plugins are loaded.
Before deleting anything, please post the contents here.