Turn Spy Sweeper off before installing Trend.
Open Spy Sweeper, click Options, Program tab, uncheck 'Load the program at Windows startup' and reboot.
Install Trend
Reboot
Start Spy Sweeper (from Start, All Programs, Webroot, Spy Sweeper)
Go back into Options, Program tab and check 'Load the program at Windows startup'
Let us know if you still have problems.