i am having this very funny problem. most of the times, when i try booting my pc, while loading windows, the system just freezes. on trying a safe mode start, the system froze while loading a *Mup.sys* file. also many a time, after the system boots up after somehow crossing this hurdle, the modem is not detected, i have to shut down the system, switch off the modem, switch it on, and then restart the system and pray that it gets detected. my system config is as follows, p4 1.5 ghz, 128 mb 266 mhz ram,d-link external modem (configured as a standard modem coz the drivers provided were unsigned), 845 chipset gigabyte motherboard. dvd rom and cd writer, usb devices include a scanner and a printer. win xp home edition is the os with sp2 loaded. quick heal antivirus is installed. can't think of anything else. somebody please help. if any other information needed, i will tell.