Error code -50

Hi, I did an automatic software update for OSX Leopard yesterday and since then I've been getting a -50 error message everytime I try to move a file into the trash or to my external hard drive. Also the time machine can't back up automatically since then. Has anybody got any ideas please, I'm not really a techie so simple answers (if thats possible with Mac issues!) would be appreciated...
Many thanks

Hi there farmer and welcome to M-F .... I tend to stay away from SU when i do my OS update.
So download the 10.5.8 Combo Update from the Apple site and report back ...
Best i have ATM

Cheers

I'd try verifying permissions in disk utility first, and then see if you can trash without error.

Wowzer!
The disk utility advice worked, thanks a million! Wish I'd have known about this site and you guys years ago..
Mandy

Glad it helped, and now you know where to come should you have any problems in the future

Kevriano said:

I'd try verifying permissions in disk utility first, and then see if you can trash without error.

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I tried this but my USB stick then greyed out and I couldn't do anything with it. PLEASE HELP!