When I bought my N900 I was shocked when I realized that the mobile needs these tons of apps. to have all the options I need !

I installed 'Petrovich' to be able to send Media files, and suddenly I was sending a song to my friend and It started making stupid things as it tells connection failed or we pair our devices so I send the file again and then connection FAILED to blah blah blah !

I can't handle this anymore so can you please help ?

I also wanted to ask about an anti-virus to install..

Is the new software allows me to send all media files directly ?

I need some information about this case