problem with Tix in Python2.5

[gordon]

hi
i have been using some Tix widgets in my gui code in Python2.5 and
they used to work without any problems.Now all of a sudden i am
getting error messages like
"couldn't read file "E:/Python25/tcl/tix8.4/ChkList.tcl": no such file
or directory....
...
This probably means that Tix wasn't installed properly."


why is this happening?Do i have to reinstall python2.5? or can i
reinstall Tix alone to my existing python installation?Can someone
help?
thanks
gordon