Thank you for your question.
This appears to be a sign of a Trojan that has infected your computer.
See this discussion, for example at Computer Cops:
"My Norton Antivirus found Trojan.StartPage in
C:\WINDOWS\SYSTEM32\CTRLPAN.DLL. I followed Norton's instructions to
remove it (e.g. disable System Restore in XP, update virus
definitions, restart in safe mode, run full system scan, and finally
reset IE home page) but it was unable to repair the file, and is
denied access to the file. Anyone know how to fix this?..."
Another user had the same problem here and both of the above fixed
their problem with CWShredder, available free from links in both of
There are many other discussions that point in this direction. Here's
another at Annoyances.org:
It seems CWShredder catches and repairs this, but I would also
strongly recommend running a virus check with current defintions and a
SpyWare checker such as Ad-Aware, available free.
You can do an online virus check here if you do not have an AntiVirus
program with current virus definitions:
And pick up the free Ad-Aware here:
I trust my research has provided you with the tools to remove this
Trojan. If a link above should fail to work or anything require
further explanation or research, please do post a Request for
Clarification prior to rating the answer and closing the question and
I will be pleased to assist further.