Microsoft technical support have solved this problem for me. I'm not sure what they did as they logged in remotely to my computer. But if you are having this problem as well it might be worth giving them a call :)
Hi Kim,
Here is the solution:
1st: Download Auto Runs.
Click Here:
http://download.sysinternals.com/files/Autoruns.zip
Link basis: http://technet.microsoft.com/en-us/sysinternals/bb963902.aspx
2nd: Find the yellow highlighted Image Paths that ends with sysmenu.dll. Usually you can locate those image paths from Scheduled Task.
3rd: Right click then delete.
4th: Try to find all yellow highlighted Image Paths that ends with sysmenu.dll from "Everything tabs, delete them.
NOTE: Carefully choose image paths that ends sysmenu.dll only, if you deleted paths that are not high lightened then it might cause some trouble booting your PC.
5th: Reboot Computer
6th: Wait at least 5 minutes to confirm that the issue has been resolved. (sysmenu.dll usually appears within a minute from rebooting the computer. )
Hope it helps :)
J.A. Tan