Windows cannot access network drive

First of all Hi to all on this forum :)

I'm having a problem with my network, which consists of 2 Windows 7 Ultimate x64 PCs.

My Dell laptop is connected through a wireless router to my HTPC and both computers share their Multimedia drives, where the connection worked perfectly in the old school workgroup network setup (no HOMEGROUP). I say workED, right up until a transfer of files from laptop to HTPC got disrupted as the HTPC suddenly crashed. I restarted it, deleted part of the files that got transfered, but now the connection only works one way: HTPC to Laptop.

I've tried every possible solution google gave me, but to no avail... I've tried defragmenting the HTPC disk, tried fixing errors on the disk, tried removing all sharing connections and making new ones... but keep getting the same message "You do not have permission to access \\HTPC\d". I even tried system restore on the HTPC, which was successful itself, but didn't fix my problem. I have both firewalls and antivirus software off for now. Network discovery is turned on for both computers, they are in the same workgroup. I've tried reseting the router as well.

Can it be that the broken file transfer screwed the HTPC disk up? I can access it without problems from the HTPC itself.

Any suggestions? Thanks in advance...

160 views and still no help...?