Fred,
I went through a long hunt to find out why I ended up with glitches when recording on my laptop. I had all operating system sevices (local) turned off that weren't necessary for recording and still had problems.
The problem ended up being simple. The hard drive was too slow to keep up with the data flow simply because DMA was not enabled for the hard drive controller. Check by going to device manager and looking at "properties" of the ATA/IDE hardware controller to be sure that DMA is enabled. If running in the PIO mode, there is sure to be trouble.
Walt