As of two months ago nearly all the rar files (r01,r02,r03,etc) I download that are between 40mb-100mb never extract properly.
These are the error messages I get

With 7z – "CRC failed in ‘name of file’. File is broken"
With Winrar – "Packed data CRC failed in ‘name of file’. The volume is corrupt" with WinRAR (tried several versions)

Now I know you can set winrar to ignore the message and continue. But I need to know, is this due to some sort of hardware failure?
I ran memtest 86+ for 14 hours with no errors. Possibly my harddrive is going? (despite not finding any errors with hd diagnostic software)

So then I decided to move the exact same files over to my old computer. They extract perfectly. So its obviously not caused by the download source.

The strange thing is I can extract 1gig rar files perfectly. But if the 1 gig extracts into smaller rar files I cannot extract those.

I already replaced the RAM with new memory. To no avail.

If this helps my specs are :
Windows 7 operating system (tried it on my dual-boot Windows XP SP3 as well)
ASUS Striker Extreme motherboard
8 Gigs Crucial Ballistix DDR2
500gb Seagate Barracuda 7200.10 drive
1tb Western Digital external drive
ATI Radeon 2900xt graphics card

Oh, and i’ve formatted my harddrive twice since these errors. I’m hoping its something as cheap as replacing the CMOS battery. 😛
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Solidus – I know the files aren’t corrupt due to the download itself because the exact same files extract perfect when I move them to a different computer.
Oh and i’ve tried re-downloading. No luck.