That would most likely be the cause of the problem, as it's not compatible with the client version due to a dependancy on a few dlls
Hope it's too much trouble for you to install the full version,
I hope this helps.
And Hi, uklee and tommasi (Merged your question as one, hope you don't mind).
I'm aware 3.62 may connect but it has bugs, patched by 3.71 and there shouldn't be really any reason it's not working unless you've not got the full version of .net?
You may find your downloads corrupted, by the old versions however the latest release will allow you to download psn games from the store and they'll install (as long as you've paid for them) the psn has changed a lot since 3.62 was released and it may look suspicious on Sonys network if your using old connection methods etc and not there most up to date url's etc.
I highly recommend you update to 3.71, for your own safety you should be able to find everything you need on this thread.
>> Make sure you have .NET 4.0 Full (Not Client)
>> Tried disabling Windows UAC
>> Right click, run as admin.
>> A fresh install to a path containing no spaces (BAD = C:\Users\Im Dave Hi\Look at this space\ | GOOD = C:\MyPSN\Yay.exe) some people are lucky and it works anyway.
If it doesn't work still, can you post a copy of the error to see if it matches robe36's error? cheers that way I can locate the issue, or at least understand an exact cause.