Be really sure that your db files are not compressed first. Right click on both the db files and the logs for all DBS (especially those that are system db's but basically any you want to use) go to properties then advanced and un tick the box that says compressed. Using certain OS cleaners will compress the files on your hard drive including db and log files. This causes them to behave as though they were corrupted.
If you have db's that you haven't backed up that are corrupted then try my suggestions as compressed db's will give you all sorts of errors. I dont want to sound pedantic but I would make sure I had good backup procedures and verbose logging rather than having a tool to recover corrupted databases. This sort of thing is last resort.
If you really need the program lot of tools available in Market. If you don't have the time and desire to search for, you can try a suitable tool SQL Server Recovery Toolbox which I usually use. This is my recommendation at your discretion.
http://www.oemailrecovery.com/sql_recovery.html 
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