Invalid Syntax Error/Windows Media Player??

I am having a few problems lately. First off, I have songs saved onto my comptuer that I have played for the longest time. Lately, whenever I try and open them, it tells me that teh file was cached wrong or something like that. Yet the songs had played thru it forever. One thing I do know is that when i tryed to paly a song the first time that this occured, it brought up a microsoft site and ith ad me download a license. Which i did, then i had to override the old license to save it. Then it did this.

Also, lately, whenever I try to do certain things, it takes me to a page and says invalid syntax error. Which is peculiar. If I use hotmail, I have to wait for the entire page to load, then cilck a link, otherwise it will take me there. I can not use such features as msn chat because it will not let me click the link. One thing I have noticed...is that it usually occurs if when I put my cursor over the hotlink, it says java script. So i tried enabling all java script fucntions. That did nothing. Please help me.