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:

ESET's Online Scanner :

Download and scan with Hitman Pro:

Let us know how you make out..