Parallels Desktop v3.0 corrupts downloads on Mac Pro but not on MacBook Pro

Parallels Desktop for Mac version 3.0 is corrupting downloads and updates on my Mac Pro, but not on my MacBook Pro. Symptoms include the message "The digital signature for this package is incorrect. The package may have been tampered with or corrupted since being signed by “Apple” when downloading a software update. Downloading a dmg software package fails at the end of the download with a "Verification failed" message. Trying to mount the package manually fails with codec overrun error. These are symptoms of a corrupted download.
The problem disappears when I uninstall Parallels. It reappears if I reinstall Parallels. My Mac Pro and MacBook Pro are nearly identical in installed software. I have reviewed the problem with AppleCare in excruciating detail (an hour yesterday and another hour today with an AppleCare Specialist). It is a new issue to them. We have send a support request email to Parallels.com.
This has been a difficult problem to troubleshoot. I had tried every suggestion that I could find on the forum under "Digital Signature is incorrect", "Verification failed", "codec overrun", etc., without success. I won't go into the painful details of the troubleshooting process, unless encouraged. But I will update the forum when I know more. Meanwhile, if you have any ideas please pass them on.

The problem has been solved by replacing the Linksys WRT54G Wireless-G Router with an Apple AirPort Extreme 802.11n Wireless Base Station. After completing the installation I was able to successfully download my test .dmg files on the both the Mac Pro and the MacBook Pro with Parallels 3.0 installed.
Before I had made this change I had worked with a Parallels tech support expert. (By the way, they were very responsive.) We had tried a number of things without success, including disconnecting and restarting the cable modem and router.
I don't know why this change in routers worked. It couldn't be related the WEP encryption on the Linksys versus the WPA2 security on the Airport Extreme because the problem was not with the wireless connection to the MacBook Pro. The problem was with the Mac Pro, which was connected via an ethernet cable, in both cases.
I am now happy, but confused.

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