Stuttering problem under windows 7 64bit

Stutters on playback and recording about 30-60 seconds of playing fine and then a spike. I used the DPC latency tool and it said there was a problem with the drivers. It showed a definite spike periodically. I'm using the 6.08 drivers

System is: i5 / gigabyte GA-Z87-D3HP motherboard / 8 gigs ram / wd black hd

Worked fine on my old system under xp and windows 7 32 bit. Replaced with an identical (known and tested working) card thinking it was a hardware issue and it did the same thing.

Please help!
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