Documents usually won't make much difference. They're all pretty small in size.
Programs, however, can really gobble up memory, especially if they are graphics-heavy. Go into My Computer and then check the properties on the OS drive (probably C:). How much free space does your hard drive have?
At least 428 GB.
Free space? Not total space? If that's free space, that should be plenty.
You should wait for MathMate or another tutor with more experience with this type of thing. Since I never put those graphics-heavy programs on my computers, I don't have the problem!!
I think I would open up task manager, and see what is occupying CPU resources.
How much memory do you have?
Here are some resource requirements, briefly:
1+ GHz processor (not a problem these days)
1+ GB memory
Add 1 GB if you run XP emulation.
(See officially from Microsoft:
(Broken Link Removed)
You have plenty of disk.
If everything is OK, go with what M. Pursley suggested: check if the CPU is busy somewhere.
Do you have a problem on boot-up, or whenever control panel is called for?
On boot up, the CPU may be busy setting up network and a whole lot of other things.
Was the disk (flashing red light) running when waiting for control-panel?
If so, it may be thirsty for memory.
If you are handy with opening the hood, you can try swapping the two memory boards. If things change, it may be a hardware problem.
Finally, if you still have problems, post your config/specs.
If you are using a high/medium-end graphics card, do not let Windows 7 search for drivers, install the custom graphics drivers instead.