Lews, you can test your system with one of this two scannprograms:
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AdAware-
SpyBot - Search and DestroyI use both - one can maybe not found a keylogger / trojan, but the other one <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
It is always good to have a up-to-date antivirus program installed and let a regulary check (once per week) over the whole system run.