Hello aguswgs and welcome to Seven Forums.
I found a reference to ahadmin.exe at the Webroot/Prevx site. It's one of several aliases for the basesrv.exe malware. BASESRV.EXE, Prevx
If your installed antivirus caught this, it should have given you the opportunity to quarantine or delete it. Run a full scan with your antivirus/antispyware. It would also be a good idea to run a couple more free
on-demand scanners to double check your computer. Some recommended products are Malwarebytes, Hitman Pro, Superantispyware, Trend Micro HouseCall, Comodo Cleaning Essentials, Eset, etc.