johnjohn..

There's no need to fear that the below tools will "make the problem worse". Hopefully, they'll help. They're all free. Hitman Pro offers a trial copy, which is free to use for 30 days. If TDSSKiller detects a problem, I would still suggest scanning with other two.

Scan with Kaspersky's TDSSKiller Utility. The instructions and download can be found here:
http://support.kaspersky.com/viruses/solutions?qid=208280684

ESET's Online Scanner :
http://www.eset.com/online-scanner

Download and scan with Hitman Pro:
http://download.cnet.com/Hitman-Pro-3-32-bit/3000-2239_4-10895604.html

Let us know how you make out..
Carol