Homegroup Is Corrupted And Works Until Next Reboot?

I have two windows 7 home premium 64 bit installs in my home on the same networkI've set up a homegroup on one and put the password on the other pc. Turned off asking for credentials, turned on network discovery, have set up two shares on the 2nd pc with EVERYONE as having full access. (the shares are drives, not folders).By all means, I should be able to access the shares on the 2nd computer, but I always get prompted for user/pass. I should add, the user/pass on both computers is the same and they are both in the same workgroup, MSHOME. By reading up on a few other posts here, I decided to try to rename the second computer, reboot, name it back to the original, reboot, and see if that fixed the problem. It did, and I was able to access the shares without having to put in a user/pass.

However, MS patches came down and I had to patch and bounce both machines (typical weekly patch load). After doing so, I'm back to the same problem--requesting the user/pass again. And, when I do put in the user/pass, it doesn't connect either.I'm stumped. I did read another post where someone had to put in the user or group of NETWORK with full access and that solved his problem, but for the life of me, I cannot figure out why I cannot get this homegroup to work properly. I've set up probably 4-5 homegroups in the past without any issues and have done all of the same things here