I have two laptops each dual-booting XP/Pro SP3 and Windows 7 , and a Desktop running XP home SP3 which has 3 hard disks holding all the folders I wish to share.
The 3 Desktop drives are mapped on both XP/Pro and 7 on both laptops - I haven't had and don't have any problems accessing the drives from the XP systems, but both Windows 7 systems frequently either fail to reconnect the drives on booting, or the network path fails after a while.
I know Homegroup is aimed at Windows 7 PCs but my question was have you set up Homegroup on your PC to see if it allows your mapped drives to reconnect? I have set it on and can connect to NAS drive so may be coincidence.
I am using several mapped network drives and they are fine also my WebDav folders are good (there was a bug in 6065 and 7000 where you couldn't connect to FTP).
Check that your network connection is stable on both machines, it could be that that the machines are loosing connectivity or try assigning a static IP as if they are renewing but to another IP then the drives may drop every now and then.
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