Does length of film cause jerky playback

I have been editing a travel film .All was fine when it was 15 minutes long even with a soundtrack and narration. Now it is up to 40 minutes long chunks of the tracks get missed out intermittently and the media pending screen show upon the monitor panel.I have a dual core cpu with 4 mb memory. Are these problems caused by the length of the film.?

Thanks for the info.
You state:
  c drive ST350830  internal  1021  fairly full
I would clean off some files (maybe locating them on the USB external), so that you have at least 40 - 60GB of free-space. Note: at about 70% of capacity, an HDD slows down, and the closer that you get to 100% capacity, the slower it goes. At 100%, there is a good chance of catastrophic failure. Also, as you likely have your Page File dynamically managed (the default for Windows), and located on your C:\, when editing video, it can swell too. Last, as one writes closer to the hubs of the platters, the slower the read/writes will be.
A few more comments and a question: who is the mfgr. of that HDD, and what is its speed. For Video, one really, really wants 7200RPM, or higher. Also, the limit on the WD external will be the USB connection. I have found those to be far too slow to edit to/from, and at least the older ones were prone to read/write errors, including the dreaded Delayed Write Failure, which can cripple a USB external. That happened most often with a fast computer, when its writing would exceed the speed of the connection.
Good luck,
Hunt

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