Errors occurred while Windows was synchronizing your data

I found the easiest way was to disable offline
files through the domain group policy. However since its only one
machine thats got the problem I'd say its probably best to disable
offline files through the local group policy:

1. Start > Run > 'mmc'
2. File > Add/Remove Snap-in > Add > Group Policy > OK.
3. In the GP window; Comp Config > Admin Template > Network > Offline
Files.
Disable 'Allow or Disable use of offline files feature'

You may also want to disable 'Do not auto make redirected folders...'
in User Config > Admin Temp > Network > Offline Files.

Delete cached copies of roaming profiles

Using Group Policy to delete cached copies of roaming profiles

This article discusses how you can use Group Policy to delete locally cached copies of roaming profiles.

MORE INFORMATION
If you enable Group Policy, any local copy of a user's roaming profile is deleted when the user logs off. However, the roaming profile still remains on the network server that stores it.

You can configure a Group Policy Object (GPO) to perform the preceding behavior by performing the following steps:
1. Edit the GPO that you want to modify.
2. Locate the following section: Computer Configuration \ Administrative Templates \ System \ User Profiles.
3. Double-click Delete cached copies of roaming profiles (the Group Policy setting).
4. Click Enabled.

NOTE: The preceding steps involve a computer configuration setting. When Group Policy is applied to a container, such as an organizational unit, it can apply to all computers in that organizational unit and not necessarily to all users in that organizational unit. For example, if a user in the organizational unit that has this policy, logs on to a computer that is in another organizational unit that does not have this policy, a copy of the roaming profile can remain on the computer. Once this policy is applied to a computer it applies to all users that use that computer.

Using Group Policy to delete cached copies of roaming profiles

If you enable Group Policy, any local copy of a user's roaming profile is deleted when the user logs off. However, the roaming profile still remains on the network server that stores it.

You can configure a Group Policy Object (GPO) to perform the preceding behavior by performing the following steps:

1. Edit the GPO that you want to modify.
2. Locate the following section: Computer Configuration \ Administrative Templates \ System \ User Profiles.
3. Double-click Delete cached copies of roaming profiles (the Group Policy setting).
4. Click Enabled.

NOTE: The preceding steps involve a computer configuration setting. When Group Policy is applied to a container, such as an organizational unit, it can apply to all computers in that organizational unit and not necessarily to all users in that organizational unit. For example, if a user in the organizational unit that has this policy, logs on to a computer that is in another organizational unit that does not have this policy, a copy of the roaming profile can remain on the computer. Once this policy is applied to a computer it applies to all users that use that computer.

Delete cached copies of roaming profiles

Using Group Policy to delete cached copies of roaming profiles

This article discusses how you can use Group Policy to delete locally cached copies of roaming profiles.

MORE INFORMATION
If you enable Group Policy, any local copy of a user's roaming profile is deleted when the user logs off. However, the roaming profile still remains on the network server that stores it.

You can configure a Group Policy Object (GPO) to perform the preceding behavior by performing the following steps:
1. Edit the GPO that you want to modify.
2. Locate the following section: Computer Configuration \ Administrative Templates \ System \ User Profiles.
3. Double-click Delete cached copies of roaming profiles (the Group Policy setting).
4. Click Enabled.

NOTE: The preceding steps involve a computer configuration setting. When Group Policy is applied to a container, such as an organizational unit, it can apply to all computers in that organizational unit and not necessarily to all users in that organizational unit. For example, if a user in the organizational unit that has this policy, logs on to a computer that is in another organizational unit that does not have this policy, a copy of the roaming profile can remain on the computer. Once this policy is applied to a computer it applies to all users that use that computer.