There are some links on this website that may help. Some require income qualifications.
http://www.hud.gov/local/index.cfm?state=mi I would agree with Michelle most lenders have tightened their requirements. The companies available in the Housing Counselor links can assist you in getting your finances under control which will increase your credit score. There are also several Home Buying Programs for Michigan residents.
Your County may also offer free housing counseling for residents.
If you have money saved there are number of land contracts out there as well. So while you are working on your credit you can purchase a home on a land contract.
I do not do land contract but if you are interested e-mail me and I can give you a few referals.