Larch Computer Services Ltd ISO 9001: 2000 approved supplier of IT Support Services in Hampshire Berkshire & Surrey since 1986. Computer Sales Installation & Maintenance Network Support Wireless Remote Access VPN. Specialist Services Larch Computer Services offers flexible Computer Maintenance Agreements, which include: Hardware Maintenance, Operating System Support, Network Support, (Network Operating System & Network Infrastructure Support), Backup Software Support, Antivirus Software Support & Application Software Support. Trading Since 1986