Michelle Thomas, install the following software:
AVG Free-- Anti Virus
Zone Alarm Free-- Firewall
Microsoft Giant Anti-spyware-- Anti-spyware. Only download and install if Windows XP is used.
Spybot S&D-- Anti-spyware. I suggest you install this when it concerns a pre-XP operating system. Or in addition to MS Anti-spyware if it concerns an XP operating system.
Take the following steps:
1. Install these programs
2. Block outgoing Trojan horse traffic with firewall
3. Boot into safe mode
-- Press F8 before loading Windows
4. Run scanners
If you require more help configuring or operating these applications, do not hesitate to report back.