Crazy Audio distortion

Howdy all
My name is Craig and my audio is horrible. I have a dual gig G4 running OS 10.4.4. My audio interface is an Edirol UA 30. I have Reason 3.04, Digital Performer 4.6 and Logic Express 7.1.1 installed but the problem is not limited to these apps, all apps with audio (iTunes, Quicktime) are affected. Its like a distorted echo and alot of background noise. It becomes especially prevalent in Logic and DP when plug-ins are used. In Reason it is unbearable. I have done clean installs and searched for a mention of the same problem but haven't been able to find anything too specific. If anybody could help i sure would appreciate it.

Crazy Distortion

The UA 30 is connected to the computer with USB. I record through the Guitar /Mic Chaneal and the Line In. The Audio Values in Audio Midi read 1.00. When using Reason with DP the distortion gets recorded. when recording from the UA 30 there is ni distortion, just on playback and always with plug ins, even the Apple Audio Units. It's not as bad with no plug inns but there is still a strange distoted "echo" of the track.
Thanks guys.

Solved

Thanks guys, a new hard drive and maxed out memeory seemed to have solved the problem.