Audio rate problem? or tired MAC?

Hi everyone, I do hope that someone can help me..
in this (for me) important moment..!
I have an Final Cut project, which includes different versions (language,
length, with logos etc )of one movie.
Now I am finishing the English subtitled version and I
haven't yet backed up the finished movie in a tape.
But my Mac, which has continued doing editing for 1 year and half,
recently acts strange; the immage and the sound becomes unsyclonized.
Yes, it is not a new problem, but 4 times out of 5 the cassettes
don't come out perfectly, which seems to me too much.
The MAc also show the problem with Final Cut HD: the immage doesn't show
up in a conectted video camera, so I can't make a cassette at all.
The problem 1:
I have stupidly built the project
inside the computer not in external HD, so I can't reinstall
the operation.
(The free space now is 90Gb. Doesn't seem too small..)
The problem2:
Only now I have found that one of the long video clips that
I used for all the versions have a strange audio rate: 48.001 Khz.(Pricisly
it also shows 48000.8Hz in browser.)
When I see this clip in the Viewer it makes PI PI PI sounds,
but since I had finished editings before in Imovie, I didn't notice them.
Moreover, until now other versions from which I made cassettes didn't show
any strange problems even though the audio rate was also slightly different.
My question is:
1
In general, when you find a clip like this (with strange audio rate )
is it necessary to replace it with a new video clip? What is the cause??
Could it cause problems when I will make a DVD with
DVD studio Pro, exporting Quicktime mov. file into it?
2
To refresh my computer.. (it seems an only solution.. isn't it?)
will it be risky if I bring my Mac to a technical support to have it
reinstall, saving all date of Final cut project? Could it damage the project??
Could it be helpful makink a quicktime DV pal file to save the timeline,
so that I can reimport it in Final in the case of damaged project?
If someone has a good solution..I will appreciate it very much.
Thank you!
Minobu

Hi Al, thank you for the post,
RAM is "1.5GB DDR2 SDRam".
The footage was originally captured into imovie; secondly
it was exported into a cassette. (The project was purely Imovie one
before I started subtitling it with various color and sound correction.)
And then I imported it into a Final. But the process was all complicated;
I had mixed several cassettes to compose one timeline..because
some cassettes from Imovie timeline had dropframes.
I wouldn't be able to refix it anymore..
Now I am trying to export the timeline into Quicktime DV-PAL file,
at least to be able to try making a DVD in DVD studio pro,
and to save the finished movie in someway.
(Isn't Quicktime DV-PAL file re-importable into Finalcut project? Or is ther
any other format that can be helpful for me? )
Grazie,
MInobu

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