Conversion won't work with Excel


pdfcreator works with every document/program I use, Office Word works as well.
If i try to convert an excel file it just opens the program and it does nothing. It doesn’t even send the command to the virtual printer. I tried with Excel 2003 and 2010 (I have those two licenses). Any solution? Nobody seems to have posted the same problems. Permissions are all good.
Also, pdfcreator doesn’t seem to care about which is the default program to open file types. To switch between excel 2003 and 2010 I had to reinstall them every time, otherwise it just sticks to the last one installed even if you change the default programs in windows… a bug or a feature? Can this be controlled?

Windows 7.