This is really more of a server admin question than WordPress. Error logs and php.ini file locations can vary depending on the server OS.
You need to change the upload and timeout limits for php. Do that either in the main php.ini file or enable php.ini in your web directory and try:
max_execution_time = 120
max_input_time = 120
memory_limit = 128M
post_max_size = 10M
upload_max_filesize = 10M