Download disaster!

I was downloading one of your free downloads (something about speeding up my computer 3X) I think it was called “SPEED IT UP” and I had a spike and the computer re-booted and it appears when it was trying to start it gave me an error message that it lost my win.com file. I only have my restore disks and NOT a copy of windows 98SE for my H.P and really DO NOT want to do a complete formatting and lose YEARS of data, information and pictures! . I am pretty much stuck at a DOS prompt………..Any suggestions to get my computer back up and running again?
The most recent message that is on my screen is “Type the name of the Command Interpreter(e.g., C:\WINDOWS\COMMAND.COM)”

Thanks for your help! I can be reach at michaellmolnar@verizon.net