Hi, Katarina!
Yes, this is a common problem on Home Premium, I suggest trying a registry tweak to change LmCompatibilityLevel.
1. Open up Regedit
2. Go to "HKLM\SYSTEM\CurrentControlSet\Control\Lsa"
3. Create a new 32-bit DWORD and name it lmcompatibilitylevel
4. In Data give it the number 2, which stands for: Clients use only NTLM authentication, and they use NTLMv2 session security if the server supports it. Domain controller accepts LM, NTLM, and NTLMv2 authentication.
Hope it helps, if not change it back to the default value (which is zero).
If you do not feel like editing the registry you can also try this:
1. Go to Control Panel -> Administrative Tools and open up Local Security Policy
2. Go to Local Policies -> Security Options
3. Lookup "Network security: LAN Manager authentication level" and change it to "Send LM & NTLM responses"
4. Lookup "Network security: Minimum session security for NTLM SSP" and disable "Require 128-bit encryption"
Best Regards
Kimzi
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