Welcome to BC. You have come to the right place.
In normal mode, run an online antivirus check from at least two and preferably three of the following sitesBitDefenderComputer Associates Online Virus ScanPanda's ActiveScanTrend Micro HousecallWindows Live Safety Center Free Online ScanThis scanner from Trend does not require an Active X to run.
1. Detects and removes malware ( viruses, worms, trojans, etc. )
2. Detects and removes grayware and spyware
3. Restores damage caused by malware to your system.
4. Notifies about vulnerabilities in installed programs and connected network services.
5. Multi-platform support for: Windows, Linux, Solaris.
6. Easy-to-use with the Microsoft Internet Explorer and Mozilla Firefox.
Please back the results of the scans. As long as you are not seeing huge volumes of mail going out there is nothing much going Spambots
might have picked up your email address and using it.