Remote support for the small business

Hi

We would like some help please. We have a small IT company in the UK and would like to provide remote support for our customers, most of which have dial-up/broadband connections.

We are aware of PC Anywhere as a tool, but are their any FREE/CHEAP solutions to enable us to gain access to our clients PC’s? Does any version of Windows have a built-in tool we can use?

Would be grateful for advice/suggestions. The aim is to provide this support cost-effecively making it attractive to the customer.

Thanks.