Ok thanks for the help.
on other note,I search the web for my problem for tga thumbnail view and the only solution forwin vista 64 is to install the DX sdk and now I can view the tga
with out openning each image at a time or so.
Now I can see what I need to edit quickly.
For anyone intrested its a 500mb download and doesnt seem to have any procces running in the background to chew up memory.