Hi all, My first post My problem is that everytime I download and attempt to install a large file usually over 100Mb sometimes smaller, I get an error message either " CRC error" Or "this file is corrupt" error or something similar. The files are not coming from one place they are all legitamate(!) some are payware programmes etc... My system specs are as follows: Win XP SP1 ( Have tried pre service pack 1 and SP2) AMD Athlon 2800XP Radeon 9800Pro 1 Gig Ram ( All budget stuff) BT Broadband 1Mb I am currently using Sygate firewall, have also tried Zonealarm (was told this could be the problem) AVG Antivirus also have tried Norton. I am really pulling my hair out with this as it so annoying. Apart from this my PC appears to be running fine. Thanks for any help! Cheers, Garry.