ok, i tried every pci card on their own... problem did not come back.
I tried with only speakers plugged in... problem did not come back.
I tried with only mouse plugged in... problem did not come back.
I tried every pci slot too... worked fine.
I now put in ALL of the PCI cards back and plugged in speakers and mouse and everything looks good.
I also have a printer and external USB drive, external USB DVD burner, USB game controller, but all of those have been disconnected for days, so I know they weren't the problem.
Don't know why it is working fine now... everything that was connected before is connected again now and it all is working.
Oh, also still showing 131069 MB of space available.