malware warning whenever I try any plugins

Half the time that I try anything having to do with plugins, widgets, or themes, I get a “suspected malware” notice. It’s driving me nuts!!!

It says,
Warning: Visiting this site may harm your computer
The website you are visiting appears to contain malware.
Malware is malicious software that… [yadayada]…
For detailed info.. visit the Google Safe Browsing diagnostic page for 94.102.50.160.

So I go visit the site, it says there’s no malware, it’s not suspicious, but
“This site was hosted on 1 network(s) including AS29073 (ECATEL).” and
“Yes, this site has hosted malicious software over the past 90 days. It infected 1 domain(s), including wm.pl/.”

It’s the same site every time, and it shows up constantly.

I click “ignore warning” and “continue” – and it gives me a 404 error code. I can’t continue with what I was trying to do.

ARG! Right now I’m trying to enter my UA code to activate Google Analytics, and I can’t get it done.

Thanks.

Oh, if it helps, my site is http://www.lettersfromtheloft.com – just a family site, under construction.