...and swear

I seem to be in a bit of a pickle laptop wise.

I was warned by AVG that I'd picked up a Trojan so I ran a scan and cleared what I could to the vault. However, I noticed some problems:

1. When opening programs the file associations seem to have stopped working
2. Search engines seem to have been hijacked and take me to "junk" sites

I re-ran the scan and found more Trojan files - I forced these to clear to the vault and re-booted. Now I appear to have deleted "csrss.exe" from the registry and am getting the following error message when I try to connect to anything other than gmail I'm getting the error:

Firefox is configured to use a proxy server that is refusing connections

I would welcome any or all advice

Thanks

Mel