Windows 7: Windows Slow, moving Mouse helps

Ok this is my first post here. I have installed Windows 7 32 bit clean installs twice now on a Dell GX960 4 gig of Ram. I go to install Groupwise and Norton and I notice installs are going extremely slow, I can move the mouse and the speed seems normal. I have noticed this when I try to open the internet, move something, boot up, shut down I move the mouse and you can see the busy circle works normally, stop moving the mouse and the busy circle stutters and the machine seems really slow.
I have checked the event viewer and there is nothing there except where I have cancelled installs for office or adobe. I have checked the device manager and there is no conflicts. Deleted the Dell Laser mouse and rebooted, it reinstalled and still same issues.
I have installed this on 2 laptops and have no issues with them, they actually run GREAT! Decided to do my office machine and well, it is not going as smooth

Any ideas would be helpful. Anyone seen this before??

Thanks,
Doug

You said Norton. Whatever Norton app that is, completely remove it from your system by uninstalling. Do not just disable it and think it's gravy. Full uninstall needed.

Tell us if it fixes your problem.

How is it with your energy saving settings?
If it is any optimized mode or saving mode, Windows 7 will not use the both cores if the computer have two CPU cores. Check that, under the battery icon in the system field beside the clock.

Solved my issue. I finally reinstalled again making sure to take note of when the slowness starts. I noticed before the install was complete it was acting up. Once it was complete the only thing that I know we changed before and always have to change is the drive operation in the BIOS from ATA to legacy mode for Ghosting. Well that was not changed back. I changed it to ATA and that made the difference. There is no slowness on boot, shutdown, opening files, typing etc. I will now try to install my software and post back if there is any changes. Thanks