Mdworker, using all the resources, apps not responding

A couple of days a ago, I noticed there was lots of chatter coming from the hard drive.* I also noticed that the Mac Pro was very slow at doing most things, lots of beach balls and applications not responding.* Right now, all I can hear is the HDD
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I opened up activity monitor and noticed that a process name called - mdworker - was using 8.83GB or Real Mem and around 11.80GB of Virtual Mem.* These figures fluctuate, the Virtual Mem has gone as high as 14GB.* Sometimes the process goes down very low to say below a GB, then rises again.
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I have 10GB of ram installed inside the mac.* Furthermore, I've seen 100%of CPU use though mdworker.
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I've been reading about this problem, lots of advice says to move the HDD image to the privacy pane on spotlight as this is a indexing/spotlight issue, though I still want to use spotlight.

Didn't mean for it to have stars in, copied this starlight from a another forum where I've posted.


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Will this process ever end, or is there a way to stop it, as is using up all the resources?
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The only thing I've installed of late is a music plug-in called Geist and an expansion pack which came with it.
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Right now I can't rally use my mac like before, I'm writing this on an iPad.
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Any help would be great, as the mac is integeral part of m work.