Choppy footage on Import, have checked all settings......

Hi,

I'm running after effects on a XPS 9710 17 i7 UHD 64 Gb ram,RTX 3060
2 Tb SSD Hard drive. The machine is clean, nothing else on the laptop apart from the adobe suit.
I recently installed the latest after effects and dowloaded some footage to try out and I've experienced nothing but choppy footage. I've watched several hours of youtube videos and have played around with the setting in preference, adjusted acceleration and reduced resolution etc etc and nothing seems to work.

I have an older MSI laptop with the same latest after effects on and strangely the footage runs smoothly on that machine so I compied over the the same setting in preferences and composition settings and still there's no change. I changed the file ext from Mp4 to mov but that has made no difference and none of the other video footage, avi's etc seem to work either.  The footage frame rate is at 25 as is the time line, no adjustment appears to make any difference.
After several hours I'm at a loss here. The result is the same what ever i do, the footage appears to be both a bit slow and consistant in its choppinees.

I'll continue researching but any ideas would be greatly appreciated and thanks for your help here.

Paul