reinstalled SD Central, still get error message

I posted this question earlier, and a couple people suggested I reinstall SD Central and try again, but it didn't work. The problem is, most of the time when I try to apply a suite from Theme Manager, whether it is one of the 1k files or the larger ones, I get the error message "The file type you have passed for(Windowblinds, wallpaper,etc.)is not valid", and the program does not apply that part of the suite. Unfortunately, I usually get an error message for each part of the suite, so it applies nothing. The error message comes from Theme Manager, not from Windows. I also get "Do you want to apply this suite?" boxes with no components listed. Strange.In addition, some suites when applied either crash explorer or apply only a minimal pre-xp taskbar and windows with no borders, making them impossible to move(one suite I have had this problem with is Advance4Life). If I could also ask for clarification as to what the two options for wallpaper, "size" and "download" mean. Thanks very much, guys, for taking time to look at this post!
Julian