I've recently(actually,last month) reinstalled my Windows XP after I'd found
this problem. Luckily,after reinstallation,the problem seemed to be gone.
Then,I started to install my applications one by one. After installing an
application,I would reboot,log on to Windows,open Windows
Explorer,double-click any of the local partitions(usually C:\) to see if the
problem had recurred. After several smooth(without the problem recurring)
installations of applications,something weird happened.
(Note:I'm disconnected from the Internet or LAN when I install applications.)
After finishing installation of Camtasia Studio 5(with "Live Output"
installed),it recurred. So I restored my PC using Ghost 8.3 to the status
where the problem was nowhere to be found and updated my Zone Alarm Security
Suite 7.0.462.000 and McAfee VirusScan Enterprise+AntiSpyware Enterprise
8.5i. After doing that,I full-scanned my system using both ZA & McAfee. Both
said "Nothing found". So I assumed this problem had nothing to with viruses
or spywares,etc. Then,I continued installing applications,starting from
Camtasia Studio 5 again to confirm if the problem was really caused by it.
Strangely enough,this time,when I opened Windows Explorer and did what's
shown in the .gif,nothing happened. I'd rebooted PC several times to
confirm,yes,nothing happened. So,at this point,I made a Ghost backup of my
system.
Then,there came the really weird thing. After finishing installation of Nero
8,I spotted that problem again,suddenly and surprisingly. At first,I thought
it had something to with the installation of Nero Scout,so I disabled Nero
Scout and rebooted and did once again what's shown in the .gif. That problem
was still active. Oh,by the way,I didn't choose to install "ASK TOOLBAR" when
installing Nero 8.
Now,I'm totally puzzled. Why did the same problem(or symptom) occur after
the installation of two DIFFERENT applications? I guess one of the logical
answers would be:"The legitimate verclsid.exe is hijacked by some malwares."