Okay Qhost is a big pain in the ass. I was using Norton Anti-virus which qhost seems to mess with bigtime.
Note that you can catch this virus (technically a trojan) by simply visiting certain websites. The first symptom is that they blow away your homepage. They reset it to another page where they start loading system-fucks.
The second thing you will notice is that your search engine pages will be rerouted and/or your service provider will be innaccessible.
The safest thing to do is to download the latest versions of your virus-protection software and run it after visiting any unsavory websites. Run frequently.
I ran Norton's "fix" but it didn't actually solve all of my problems.
The best fix was located on Trend Micro's web page:
http://www.trendmicro.com/vinfo/viru...=TROJ_QHOSTS.A
Best of luck