Running more than one antivirus application on board in real time will actually reduce your level of protection. You also run the risk of data loss from a system crash that the instability can cause.

In the event that some malware makes it's way to your hard disk, each antivirus application will wrestle over "access" rights to the offender and will want to zip the file and arrest the application.

This struggle will (in theory) continue infinitely which can culminate in a complete system crash.

Please decide which antivirus application to keep and uninstall the other (Command Software, or Telus Security).

Please run hijackthis again and check the following:
O2 - BHO: StumbleUpon Launcher - {145B29F4-A56B-4b90-BBAC-45784EBEBBB7} - C:\Program Files\StumbleUpon\StumbleUponIEBar.dll (file missing)
O3 - Toolbar: StumbleUpon Toolbar - {5093EB4C-3E93-40AB-9266-B607BA87BDC8} - C:\Program Files\StumbleUpon\StumbleUponIEBar.dll (file missing)
You can place anything you want into your trusted zone, but doing so is equal to leaving your keys in the front door as you go away on vacation. If you agree that is a bad idea, then check the box next to this one too:
O15 - Trusted Zone: *.stumbleupon.com

Close all windows now except for hijackthis, then click the Fix Checked button.

Reboot and post a fresh hijackthis log. Please advise how the computer is performing for you now. Thanks!