If you are interested, try the following websites:
for old pc softwares : http://www.vetusware.com/
for old dos games : http://abandonia.com/
Normally, old DOS applications and DOS games will not run in Windows, but we we use DOSBOX we can solve this issue. This is a freeware, using this we can run our old dos applications and dos games on our Windows PC.
Try this software from http://www.dosbox.com/
Try the following websites to check these old softwares / dos games for virus scanning :
Site1 : http://virusscan.jotti.org/