AMMYY was on my computer...

Here's the story: I got a new HP printer from Walmart, and the disc software wouldn't install. I did what it said in the install instructions several times, but always failed. I called the HP tech support number, and a recording came on saying, "to wait for the next available tech." (however, no mention if it being HP tech support). A few seconds later, a "tech" was on the phone helping me, and after a short conversation he told me he'd like to try fixing my computer so I gave the "ok" to let him get on my computer (found out later today after I did a google search on Ammyy I shouldn't have let him!) He was on there for about 10 min. (which is enough time to do some "stuff" I guess), and he did a scan of my computer, then showed me the "errors" which were hindering my printer from installing the software: my Windows Installers were shut down due to some previous Malware or whatever. At the end, he offered to have a computer tech" fix" all my problems for me, at which time I told him I've been on here longer than I thought already and we both quit the session. I've been checking my bank account, and so far its fine. I have Kaspersky, and ran several scans, including a vulnerability scan, which told me to do about 3 very important "re-settings" which I did, and about 9 not-so-important re-settings (which I did). I would NEVER have let him on my computer had I not thought he was an HP tech in the first place. Their tech support phone number led right to him! Anyhow, my question is: Is there any way I can tell if he downloaded any of my files to his computer? Thanks very much for any help ----- Artie28