[z123]

I installed an old DOS game, Lemmings, on my 5 yr old daughters computer, along with a program named DOSbox which was supposed to be necessary to run it. My daughter played a few minutes and didn't like it as the graphics were hard to make out. After exiting the game the mouse no longer worked and we had to power off the system to try and get it to work. Powering it back up the mouse still would not work, and the screen image is very large. We don't know how to correct this as with no mouse we cannot use windows. I have in the meantime been able to boot into safe mode with a command prompt (DOS?) window but don't know what to do to fix the problem from here. Any help would be greatly appreciated, and neither me or my daughter are experts. I'm not sure what information I could provide that would be more helpful, so forgive me if this is inadequate, and I will provide any further info necessary if requested. Thank you.