Hey there guys, I've been using photoshop 7.0 for about a year now and I've never experienced this problem before. The dotted marquee selection tool ( top left of the tool bar )has just stopped working all together. Everytime I try to select part of an image orsomething with it it loads for a second then I get an error saying " Warning: No pixels are more than 50% selected. The selected edges will not be visble.", I've tried everything to fix it, even reinstalling photoshop all together but no luck. Any ideas? please feel free to help. :)

Thanks in advance.
- Jason