1. Clear your users folder
2. Check your upload setting thresholds are modest in the settings like 1500 x 1500 max
3. Try seeing if you can use imagemagick ( mogrify )
what your posting does not make any concievable sense because what your saying is help I cant upload a small file but can upload a huge one. I dont really have any information on that one but the 3 things above are what I would do.