I am trying to fix my parents Dell Inspiron 9300 running Windows XP Home Edition. They had a virus on it but I walked them through getting off using Malwarebytes Anti-Malware and Spybot Search and Destroy but they are still have an issue. I am not sure what the virus was because they had already removed it, but now whenever I try to open a program on the computer, the "open with" window comes up saying "Choose the program you would like to use to open this file:" If I try to open Help, I get a message saying "help.exe application not found." I am able to get the control panel open.
I did some research on my own and found this http://www.dougknox.com/xp/file_assoc.htm
as a possible solution. I downloaded it to another computer and got it to run off a flash drive on the broken one but it did not solve the problem. Any suggestions?