Hmmmmmmm, check out www.musicxp.net for ways to optimise your pc for home recording.
Also, make sure you have all of the critical updates for you computer from www.microsoft.com
Also, go to the presonous website and download the updated drivers if any...

I was having huge problems with my pc recently until I decided to reformat the drive. Now it runs better than ever! It was a major pain because I had to lose some software that I no longer had the licence keys for but if all else fails this could really improve your system.

Latency problems are mostly due to either RAM (how much do you have?), an old motherboard or chipset, a slow processor and/or software/hardware conflicts. You want the buffer size to be as low as possible and so the latency is as close to zero as possible. Give us some more details on your hardware (get it from System in the Control Panel).