Sound and Audio devices sharing IRQ numbers, high hardware interrupts, laggy video

"You could try to disabling the floppy, the USB ports, or turn off assigning IRQ to VGA in your BIOS. To free an irq and to hope they will be reassigned. Or disable the (integrated) sound card itself to test your system without it...

If your graphic or sound card aren't integrated (and there's no warranty sticker...), you could move one of them to a different PCI slot.

But from my knowledge it's not really an issue. You should:

double check that you use the appropriate drivers
trying to disable/unplug all your dispensable device one by one.
scan your computer for malware
removing all software which have drivers one by one. e.g. antivirus, virtual device, ...
removing the drivers of the indispensable device (and trying with windows default drivers, older or alternative)
try alternative hardware one by one

(Updated)"