something wrong with my blog

So, I can’t do anything… upload pictures add new plugins or modify anything… I tried to install a new plug in and i got…
Warning: touch() [function.touch]: Unable to create file D:\Hosting\2445607\html\blog/wp-content/redirect-by-custom-field.tmp because Permission denied in D:\Hosting\2445607\html\blog\wp-admin\includes\file.php on line 213

Download failed. Could not create Temporary file.

When I try to add pictures to posts in a post…
has failed to upload due to an error
The uploaded file could not be moved to D:\Hosting\2445607\html\blog/wp-content/uploads/2011/05.

when I try to update my wordpress version… it makes me sign in with FTP information and it never did that.Warning: touch() [function.touch]: Unable to create file D:\Hosting\2445607\html\blog/wp-content/wordpress-3.tmp because Permission denied in D:\Hosting\2445607\html\blog\wp-admin\includes\file.php on line 213
.

Is it the Jetpack that I connected to WordPress???? I need this issue resolved ASAP or I can not add any new posts or Plugins