after install avast 4.8 professional to my PC (Sony Vaio VGN SZ; WIN 2000XP; service pack 2); I can not sent and receive my e-mail anymore; even when i stop the outlook protection.
ERROR message something like (0x800CCC90) internal (POP3) mail servor error, … please contact admin …
Servor responds - ERRConsurrent connections limit in avast exceeded(pass:0, processes:ccSvcHst.ex[20]. 
???
Which is your firewall?
Which is your spam killer application?
Which is your email provider (GMail?)?
You were using Norton. Did you uninstall it?
http://forum.avast.com/index.php?topic=42901.msg358569#msg358569
This is the culprit, ccSvcHst.exe eating all the available concurrent connections. It is a part of Symantec/Norton which you either still have installed or remnants remaining, you need to uninstall it and also run this tool.
A link worth looking at, which is a program removal tool that can remove the remnants of a number of different Norton Programs:
Removing your Norton program using SymNRT