Did you format the card in the camera you used to take the snaps?
Promaster is a rebranded name as you suggest. My understanding is that a company called Cosina makes alot of the lenses and cameras.

I recommend never connecting your camera to the computer to transfer your images. Always use a card reader. What you have now is confusion about where the problem came from. Could be the connection, could be the card, could be the software. Use a card reader and Windows Explorer to copy the files over. Verify that they copied successfuly before deleting/reformatting the card.

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after transferring them to the PC (Winodws Vista) from the Compact Flash card, there may have been some corruption going on. They all looked fine on the camera. Half of the pictures showed up pink in color in the software. Don't know why, but the rest were fine. Again, I was using the Picassa software to bring them over.

On the lens itself, I would take no comfort in the fact, if it is a fact, that Tamron made the lens. Why would Tamron sell a lens to a lesser known and more dubious brand instead of selling it themselves? Very likely because they maybe made a mistake with it and produced an inventory they either could not or did not want to sell themselves. Not infrequently the marketing portion of a company makes demands on design and manufacturing that are poor compromises, and the company's marketing people misread the market. Once committed to manufacture Tamron ends up with stacks of lenses in a warehouse they don't want to put their brand label on and don't want to take a total loss on what they invested, so it becomes some lesser marketing brand's problem.

So, the price is attractive, but you are not sure of it and maybe you can find it listed in some survey marketing web site where photographers have supposedly purchased the lens and reported on it. Can you believe these supposed customer ratings on the web. Probably not. Inside the computing industry it is pretty well known those surveys of customer ratings can be easily and deliberately skewed. A PR-marketing firm can hire a high-school computer whiz to post thousands of phony ratings. Some research journalists have in fact traced survey results on web sites and found that very large percentages of apparently different individual responses were actually generated by one computer.

The marketplace is a nasty deceptive and kleptomanic community so, my advice: open your wallet a bit further if you really need the item and buy a reputable brand directly or from a reliable known market source.

I know better than to transfer from camera to PC. One should always take card out after shutting off the camera and then inserting it into a card reader. Windows Vista is an ugly environment to say the least. I am a Technical Specialist in the IT industry. Too many bugs with Vista, unfortunately the PC that I bought for my folks came with Vista.