Imageshack.us Upload it there and then post it using the image tag.
Also, the System Idle Process will not cause a CPU fluctuation like that. System Idle is exaclty that, idle. It's the unused CPU %. Sounds like you have some processess and or services running in the background.
As for the virus suggestions, could be. Run AVG, MalwareBytes, and Spybot S&D.
Here is what ya do.
1. Download AVG, MWB, and SB S&D.
2. Install them all.
3. Run AVG, then MWB, then SB S&D.
4. Reboot into safe mode.
5. Repeat step 3.
6. Reboot into regular Windows.
Should remove just about anything you have that you wouldn't want.