One of my clients recieved a phone call from a "microsoft" technician, who reportedly had seen some issues with his machine. Without thinking my client ( who is extremely embaressed but admitted to me what he did so fair do's) allowed the bogus technician onto his machine via logmein. Now he watched the techinician take over his machine and didn't see any downloads or anything particularly worrying ( Ha !). After this the caller put him onto the "resolution centre" where he was given the hard sell for some form of Reg cleaner etc. for £250 but today special offer £150 if he bought it know. At which point my client woke up and realised what was going on and terminated the call and closed the machine down. Can i please have some suggestions as to how to ensure that the bogus technician has opened any backdoors or left the machine violated in any particular way. We have run full virus and malware scans and all passwords will be changed shortly.
Any advice will be most gratefully recieved, any suggestions of removing the machine from the user because he is too stupid to have one will be giggled at but then if everyone was clued up we'd all be out of a job.