You could also look here:Freeware Replacements for Common Commercial Apps
There is not any info on the errors, which is not a good sign. I would suggest you go here Preparation Guide for HJT
, run through all the instructions & post a HijackThis
log in the appropriate forum. Someone there will help you make sure that your computer is free from malware.
A few other things:
1. Please read the guidelines at the top of the page very carefully.
2. Wait for someone from the HJT team to reply. If you reply before they do, your log may get overlooked.
3. While working through the process with an HJT member, do not make any changes to your system as it probably do more harm than good.
4. Don't post more than one topic. Doing so would create a conflict.